when was the element copper discovered? Who discovered the element copper?

Answers

Answer 1
9000bc, it’s been known forever I don’t think there’s an answer
Answer 2

The Mesopotamians discovered copper (Cu) in 9000 BC.


Related Questions

One advantage to using nuclear power is —

it produces no air pollution

it is hard to store and dispose of the waste

the expense of constructing nuclear reactors

the threat of an accident

Answers

it produces no air pollution

Answer:

it produces no air pollution

What are some ways your local environment would be affected if there was suddenly less water available?
I'll mark brainliest!

Answers

plant life dies

Explanation:

if all water disappears then plants would dry up and die, wich would impact the food chain

if 15.70g of ticl4 reacts in excess oxygen to form 10.40g cl2 what is the percent yield of the reaction

Answers

The percent yield of the reaction is approximately 88.71%.

To calculate the percent yield of the reaction, we need to compare the actual yield (the amount of Cl₂ formed) to the theoretical yield (the amount of Cl₂ that would be formed if the reaction proceeded with complete conversion of TiCl₄).

First, we need to determine the molar masses of TiCl₄ and Cl₂. The molar mass of TiCl₄ is calculated as follows:

Ti: 1 atom x 47.87 g/mol = 47.87 g/mol

Cl: 4 atoms x 35.45 g/mol = 141.80 g/mol

Total molar mass of TiCl₄ = 47.87 g/mol + 141.80 g/mol = 189.67 g/mol

Next, we can calculate the number of moles of TiCl₄ and Cl₂ based on the given masses:

Moles of TiCl₄ = 15.70 g / 189.67 g/mol ≈ 0.08274 mol

Moles of Cl₂ = 10.40 g / 70.90 g/mol ≈ 0.14676 mol

From the balanced chemical equation for the reaction:

TiCl₄ + 2O₂ → TiO₂ + 2Cl₂

We can see that the stoichiometric ratio between TiCl₄ and Cl₂ is 1:2. Therefore, according to the balanced equation, the theoretical yield of Cl₂ would be:

Theoretical yield of Cl₂

= 2 (moles of TiCl₄)

= 2 (0.08274 mol)

= 0.16548 mol

Percent yield = (actual yield / theoretical yield) 100

= (0.14676 mol / 0.16548 mol) 100 ≈ 88.71%

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What does it mean to say that scientific models are open to change? (2 points)

a
Scientific models are usually not very accurate.

b
Scientific models can be adjusted when new information is found.

c
People can adjust scientific models to fit their personal beliefs.

d
Experimental results can be changed to fit the accepted model

Answers

Pretty sure the answer is B

in the following voltaic cell, the addition of cucl2(aq) to the cathodic compartment would cause the emf to increase. sn(s) 2 cu2 ⇄ sn2 (aq) 2 cu (aq) choix de groupe de réponses. true or false

Answers

The statement on the effect of the addition of CuCl₂(aq) to the cathodic compartment is True.

What effect does the addition of CuCl₂(aq) to the cathodic compartment bring ?

According to Le Chatelier's principle, if the concentration of a reactant in a reaction at equilibrium is increased, the reaction will shift in the direction that consumes that reactant.

The reaction at the cathode is :

Cu₂ + ( aq ) + 2e- ⇄ Cu(s)

By adding CuCl₂(aq), we increase the concentration of Cu₂+ ions in the cathodic compartment. This would cause the reaction to shift to the right, which means more Cu(s) would be produced and more electrons would be consumed.

Therefore, increasing the concentration of Cu₂+ ions in the cathodic compartment will increase the cell potential or emf.

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What is the number of moles in 15.0 g AsH3?
O 5.2 mol
O 1200 mol
O 0.44 mol
O 0.19 mol

Answers

Answer:

n = 0.19 mol

Explanation:

Given mass = 15 g

The molar mass of AsH₃ = 77.94 g/mol

We need to find the number of moles in 15 g of AsH₃. We know that,

No. of moles = given mass/molar mass

[tex]n=\dfrac{15}{77.94 }\\\\n=0.19\ mol[/tex]

So, there are 0.19 g/mol. Hence, the correct option is equal to 0.19 mol.

Write the balanced net ionic equation for the following reaction between aqueous Pb(NO3)2 and aqueous NaI and correctly label the states. Use the solubility table to determine if a precipitate forms before writing the net ionic equation. Must show the (1) balanced chemical equation with the right states (2) the cancellation of appropriate spectator ions and the final net ionic equation.

Answers

  Balanced net ionic equation will be:  Pb2+(aq) + 2I-(aq) → PbI2(s)

   The balanced chemical equation for the given reaction is;Pb(NO3)2(aq) + 2NaI(aq) → PbI2(s) + 2NaNO3(aq)

This equation is balanced because the number of atoms of the elements present on both sides of the equation is equal.

The states of the substances in the above equation are:

aqueous Pb(NO3)2(aq) , aqueous NaI (aq) → soluble, based on the solubility table PbI2 (s) → precipitate, based on the solubility tableaqueous NaNO3 (aq)

Cancel out the spectator ions from the above equation and the net ionic equation will be:

Pb2+(aq) + 2I-(aq) → PbI2(s)

Hence, the balanced net ionic equation for the given reaction between aqueous Pb(NO3)2 and aqueous NaI and correctly label the states are Pb2+(aq) + 2I-(aq) → PbI2(s) and the states are as follows;

Pb2+(aq) → AqueousI-(aq) → AqueousPbI2(s) → Solid

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The ionic equation for the reaction is given as follows:Pb2+ (aq) + 2NO3- (aq) + 2Na+ (aq) + 2I- (aq) → PbI2 (s) + 2Na+ (aq) + 2NO3- (aq)The net ionic equation is the same as the ionic equation, with spectator ions removed.Pb2+ (aq) + 2I- (aq) → PbI2 (s)The final balanced net ionic equation is given as follows:Pb2+ (aq) + 2I- (aq) → PbI2 (s).

The balanced net ionic equation for the following reaction between aqueous Pb(NO3)2 and aqueous NaI and correctly label the states are given below:Explanation:Aqueous lead(II) nitrate (Pb(NO3)2) and aqueous sodium iodide (NaI) are mixed to form solid lead(II) iodide (PbI2) and aqueous sodium nitrate (NaNO3).Before writing the net ionic equation, it is important to determine whether a precipitate will form. By referencing the solubility table, it is discovered that lead(II) iodide is insoluble in water, indicating that a precipitate will form when the two solutions are mixed.The balanced molecular equation for the reaction is given as follows:Pb(NO3)2 (aq) + 2NaI (aq) → PbI2 (s) + 2NaNO3 (aq)To write the ionic equation, the insoluble solid lead(II) iodide must be separated into its component ions. PbI2 is a precipitate; it will not dissociate, while NaNO3 will dissociate into its component ions. The ionic equation for the reaction is given as follows:Pb2+ (aq) + 2NO3- (aq) + 2Na+ (aq) + 2I- (aq) → PbI2 (s) + 2Na+ (aq) + 2NO3- (aq)The net ionic equation is the same as the ionic equation, with spectator ions removed.Pb2+ (aq) + 2I- (aq) → PbI2 (s)The final balanced net ionic equation is given as follows:Pb2+ (aq) + 2I- (aq) → PbI2 (s).

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explain+how+you+could+estimate+22%+of+78+to+check+if+your+answer+is+reasonable....

Answers

You can estimate the value of 22 % of 78 by finding 10 % of 78 and then adding another 10% to reach as close to 22 % as possible.

How to estimate the value ?

Start by finding 10% of 78. Divide 78 by 10 to get 7.8. Since you want to estimate 22%, you can take the calculated value of 10% (7.8) and multiply it by 2 to get 15.6.

Next, compare the estimated value of 15.6 with the actual value of 22% of 78. Calculate the actual value by multiplying 78 by 0.22 (since 22% is equivalent to 0.22). The result is 17.16.

Compare the estimated value of 15.6 with the actual value of 17.16.

By comparing the estimated value of 15.6 with the actual value of 17.16, you can assess the reasonability of your estimate.

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I NEED HELP THIS IS DUE TMR!
A 124.6-g sample of copper has a volume of 14 cm. what is the density of copper?

Answers

Answer:

The density of copper is 8.9 grams per cubic centimeter.

Explanation:

There is a writing mistake in statement, correct form is written below:

A 124.6 grams sample of copper has a volume of 14 cubic centimeters. What is the density of copper?

Let suppose that mass of the copper sample is distributed uniformly in its volume, then we shall use the following definition of density ([tex]\rho[/tex]), in grams per cubic centimeter:

[tex]\rho = \frac{m}{V}[/tex] (1)

Where:

[tex]m[/tex] - Mass, in grams.

[tex]V[/tex] - Volume, in cubic centimeters.

If we know that [tex]m = 124.6\,g[/tex] and [tex]V = 14\,cm^{3}[/tex], then the density of the sample of copper is:

[tex]\rho = \frac{m}{V}[/tex]

[tex]\rho = 8.9\,\frac{g}{cm^{3}}[/tex]

The density of copper is 8.9 grams per cubic centimeter.

Which of the following equilibria could be used to support the claim that the addition of a small amount of NaOH to the buffer will result in only a very small change in pH? (see image)

Answers

I think First statement that is Option A, because, it has total equilibrium on both side, which will never result in increase of any pH level higher or lower than the state, hence

Option A.) is correct

identify the type of change (physical or chemical) that occurs when an iron bar rusts and when a substance freezes. use complete sentences to justify the type of change that occurs.

Answers

For the rusting of an iron bar, a chemical change occurs; while for the freezing of a substance , a physical change occurs.

When an iron bar rusts, a chemical change occurs. Rusting is a chemical reaction that involves the oxidation of iron in the presence of oxygen and water. The iron undergoes a chemical transformation and forms a new compound, iron oxide, which gives the rusty appearance. This change is irreversible and involves a rearrangement of atoms at the molecular level.

On the other hand, when a substance freezes, a physical change takes place. Freezing is a phase transition from a liquid to a solid state. During freezing, the substance undergoes a change in its physical state without any alteration in its chemical composition. The arrangement of molecules or atoms becomes more ordered as they transition from a disordered liquid state to a more structured solid state. This change is reversible, and the substance can return to its liquid state by melting.

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Why does the offspring have identical inherited traits as the parent?

Answers

Genetic inheritance occurs due to genetic material, in the form of DNA, being passed from parents to their offspring.

Which of the molecules are used as second messengers in signal transduction pathways? insulin adenyl cyclase CAMP calcium ions P3

Answers

The molecules used as second messengers in signal transduction pathways are cAMP (cyclic adenosine monophosphate) and calcium ions. Options C and D are correct.

Cyclic adenosine monophosphate (cAMP) and calcium ions are both important second messengers involved in signal transduction pathways. When a signaling molecule, such as a hormone or neurotransmitter, binds to a receptor on the cell surface, it initiates a cascade of intracellular events.

One of these events is the activation of enzymes, such as adenylate cyclase, which synthesizes cAMP from ATP. cAMP then acts as a second messenger by binding to and activating protein kinase A (PKA), leading to the phosphorylation of target proteins and the amplification of the signal. Calcium ions also play a crucial role as second messengers by mediating various cellular processes.

They can be released from intracellular stores or enter the cell through calcium channels, and their binding to specific proteins triggers downstream signaling events. Together, cAMP and calcium ions function as key mediators in signal transduction, transmitting and amplifying signals from the cell surface to the intracellular environment. Options C and D are correct.

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Coke in a Coca Cola bottle has a volume of 500 ml and a mass of 756 grams. What is its density

Answers

Answer: 1.11 g/mL is the density

When an aqueous solution of silver nitrate is
mixed with an aqueous solution of potassium
chloride which are the spectator ions?

Answers

Answer:

[tex]K^{+}[/tex] and [tex]NO_{3}^{-}[/tex]

Explanation:

The equation for the reaction is AgNO3(aq) + KCl(aq) ==> AgCl(s) + KNO3(aq)

With all the ions, it is

[tex]Ag^{+}[/tex](aq) + [tex]NO_{3} ^{-}[/tex](aq) + [tex]K^{+}[/tex](aq) + [tex]Cl^{-}[/tex](aq)  ==> AgCl(s) +

[tex]K^{+}[/tex] and [tex]NO_{3} ^{-}[/tex] do not change, so they are the spectator ions and are removed

The ionic equation is:

[tex]Ag^{+}[/tex](aq) + [tex]Cl^{-}[/tex](aq) ==> AgCl(s)

What is the pOH of a solution whose pH is 12.41?

Answers

Answer:

1.59

Explanation:

14=pOH+pH

pOH=14-12.41

pOH=1.59

An object traveling around another object space is in blank

Answers

Answer: An orbit is a regular, repeating path that one object in space takes around another one. An object in an orbit is called a satellite. A satellite can be natural, like Earth or the moon. Many planets have moons that orbit them

HOPE THIS HELPS

Which is a function common to both the muscular and skeletal systems?

Answers

Answer:

please give me brainlist and follow

Explanation:

In the musculoskeletal system, the muscular and skeletal systems work together to support and move the body. The bones of the skeletal system serve to protect the body's organs, support the weight of the body, and give the body shape.

Answer:

B. bending of the arm

Explanation:

A lake has been infected by some type of new algae that is unknown. Every single day the amount of surface area that the algae takes up doubles. Day 1 has a certain amount, day 2 it is 2x that amount. It takes 87 days for the entire lake to be overrun by this new algae. How many days does it take to cover half of the lake? Show your work and explain your thinking. In science we need to be able to justify our answers.




hint: It is not the "obvious" answer.

Answers

Answer:

It takes 86 days take to cover half of the lake

Explanation:

In the day #1, the amount of the algae is X,

In the day #2 is 2X

In the day #3 is 2*2*X = X*2²

...

In the day #n the amount of the algae is X*2^(n-1)

Assuming X = 1m³. In the day 87, the area infected was:

1m³*2^(87-1)

7.74x10²⁵m³ is the total area of the lake

the half of this amount is 3.87x10²⁵m³

The time transcurred is:

3.87x10²⁵m³ = 1m³*2^(n-1)

Multiplying for 5 in each side:

ln (3.87x10²⁵) = ln (2^(n-1))

58.9175 = n-1 * 0.6931

85 = n-1

86 = n

It takes 86 days take to cover half of the lake

Which plate does not appear in both hemispheres?

Indo-Australian
African
Pacific
Eurasian

Answers

Answer:

Indo-Australian

Explanation:

Indo-Australian does not appear in both hemispheres.

Answer:

I can clarify, its into Australian

what product(s) forms at the cathode in the electrolysis of an aqueous solution of k2so4?
1. Sulfur
2. H2 and OH-
3. K
4. O2 and H+

Answers

We can see here that the product(s) formed at the cathode in the electrolysis of an aqueous solution of [tex]K_{2}SO_{4}[/tex] are: 2. H2 and OH-

What is electrolysis?

Electrolysis is a chemical process that involves the use of an electric current to drive a non-spontaneous chemical reaction. It is typically carried out in an electrolytic cell, which consists of two electrodes—an anode (positive electrode) and a cathode (negative electrode)—immersed in an electrolyte solution.

During electrolysis, when an electric current is passed through the electrolyte, chemical reactions occur at the electrodes.

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In the cytosol of rat hepatocytes, the temperature is 37°C and the mass-action ratio, Q, is [ATP]/[ADP][Pi] = 5.33 x 10M- Calculate the free energy required to synthesize ATP in a rat hepatocyte (AG'º for ATP hydrolysis is -30.5 kJ/mol.)

Answers

The free energy required to synthesize ATP in a rat hepatocyte is 24,365.6364 J/mol

To calculate the free energy required to synthesize ATP in a rat hepatocyte, we can use the formula:

ΔG'º = -RTln(Q)

where:

ΔG'º is the standard free energy change,

R is the gas constant (8.314 J/(mol·K)),

T is the temperature in Kelvin,

ln(Q) is the natural logarithm of the mass-action ratio.

Given:

ΔG'º = -30.5 kJ/mol

T = 37°C = 37 + 273.15 = 310.15 K

Q = 5.33 x [tex]10^{(-10)[/tex] M

First, we need to convert ΔG'º from kJ/mol to J/mol:

ΔG'º = -30.5 kJ/mol = -30.5 x [tex]10^3[/tex] J/mol

Next, we can calculate the free energy required to synthesize ATP using the formula:

ΔG = ΔG'º - RTln(Q)

ΔG = [tex](-30.5 * 10^3 J/mol) - (8.314 J/(molK) * 310.15 K) * ln(5.33 x 10^{(-10))[/tex]

≈ -30,500 J/mol - 2576.1911 J × (-21.3364)

≈ -30,500 J/mol + 54,865.6364 J

≈ 24,365.6364 J/mol

Calculating this expression will give us the value of ΔG, which represents the free energy required to synthesize ATP in a rat hepatocyte.

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answer 1-5 of lesson outline for brainiest

Answers

Answer:

see explanation

Explanation:

1. mid-ocean ridge

2.gravity

3.normal,reverse

4.cools

5.stripes

6.spreading

7.continents

What is the maximum pH an aqueous solution of 0.050 M Cu(NO3)2 can be adjusted to before a precipitate of Cu(OH)2 will form?
a. 4.2
b. 5.0
c. 7.0
d. 8.5

Answers

5.0 is the maximum pH an aqueοus sοlutiοn οf 0.050 M Cu(NO₍)₂ can be adjusted tο befοre a precipitate οf Cu(OH)₂ will fοrm

What is pH?

pH, οften knοwn as acidity in chemistry, has histοrically stοοd fοr "pοtential οf hydrοgen" (οr "pοwer οf hydrοgen"). It is a scale used tο describe hοw basic οr hοw acidic an aqueοus sοlutiοn is. When cοmpared tο basic οr alkaline sοlutiοns, acidic sοlutiοns—thοse with higher hydrοgen (H+) iοn cοncentratiοns—are measured tο have lοwer pH values.

Using a cοncentratiοn cell with transference, the pοtential difference between a hydrοgen electrοde and a standard electrοde, such as the silver chlοride electrοde, is measured tο get the primary pH standard values. With the use οf a glass electrοde, a pH metre, οr a cοlοr-changing indicatοr, the pH οf aqueοus sοlutiοns can be determined.

Cu(OH)2⇔[tex]Cu^2 +2OH-[/tex]

s[tex]^2=1.0*10^{-19}[/tex]

[tex]s=3.16*10^{=9}[/tex]

[tex]{OH-}=2s=6.3*10^{10^{-19}[/tex]

[tex]{H+}=10^{-14}/OH[/tex]

[tex]{H+}=1.58*10^{-6}[/tex]

[tex]pH=-log(1.58*10^{-6}[/tex]

pH≈5

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Can someone help with 10 a and b please

Answers

Answer:

for question a element A and B are isobars

for question b element C and D have the same atomic numbers.

Explanation:

element A and B are isobars because they have the same mass numbers but different atomic numbers. The different atomic numbers is  as a result of the difference in proton number of each elements A and B. (A and B are two different elements). element C and D are isotopes of the same element  because they have the same atomic numbers (same number of protons) but differ in number of neutrons resulting in the different number of mass numbers. (C and D are the same elements)

determine how many grams of kno3 would dissolve in 100g of water at 50 degrees celcuis to make a saturated solution

Answers

The amount of KNO₃ would dissolve in 100g of water at 50 degrees celcuis to make a saturated solution is 44 g.

To create a saturated solution of KNO₃ in 100g of water at 50 degrees Celsius, the following steps should be taken:

Step 1: Find out the mass of the solvent in the saturated solution.

The solvent is water in this instance. So, using the formula for the mass of a solution, we can calculate the mass of the solvent in the saturated solution as follows:

Mass of solvent = Mass of solution - Mass of solute

= 100 g - Mass of KNO₃

Step 2: Determine the amount of solute that would be dissolved in the solution to make it saturated.

The mass of KNO₃ that would dissolve in 100 g of water at 50°C to create a saturated solution is 56g/100g of water.

Step 3: Calculate the mass of KNO₃ that would dissolve in 100g of water to make a saturated solution.

Mass of KNO₃ = Solubility of KNO₃ × Mass of solvent

Mass of KNO₃ = 56 g/100 g × (100 g - Mass of KNO₃)

Now, let's solve for Mass of KNO₃;

56 = 56g(100-Mass of KNO₃)/100100 - Mass of KNO₃ = 100

Multiply both sides of the equation by 100 to obtain;

5600 - 100 Mass of KNO₃ = 100

Mass of KNO₃ = 5600/10100 - 56

= 44 g

Therefore, 44 g of KNO₃ would dissolve in 100g of water to make a saturated solution.

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Which of the following statements is not true? a. Water is polar. b. Water stabilizes temperature. c. Water is essential for life. d. Water is the most abundant atom in Earth’s atmosphere.

Answers

Answer: d. Water is the most abundant atom in Earth’s atmosphere.

Explanation:

Water percentage in the atmosphere is 0.001 percent only as it not the major reservoir or source of water. The water is available in the atmosphere in the form of water vapors. These water vapors when aggregate and their concentration becomes high they fall down as rain on earth so the rain is collected in water reservoirs like oceans, rivers, lakes, ponds, aquifers, and other sources of water, which are the components of hydrosphere on earth. So, hydrosphere is most abundant in water. Moreover, water is not an atom instead it is the molecule formed by the combination of two molecules of hydrogen and one molecule of oxygen.

what is an magnetic pole

Answers

Answer:

Earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from the Earth's interior out into space, where it interacts with the solar wind, a stream of charged particles emanating from the Sun.

T/F. throughout history, people have used chemicals to change their moods, behavior, and levels of consciousness.

Answers

The statement "throughout history, people have used chemicals to change their moods, behavior, and levels of consciousness. " is true.

For example, ancient civilizations used alcohol, opium, and other natural substances for medicinal and religious purposes.

In modern times, psychoactive substances such as caffeine, nicotine, and prescription medications are widely used to alter mood, perception, and behavior.

Some of these chemicals are legal, while others are illegal or controlled substances that can lead to addiction, overdose, and other negative consequences. It is important to understand the risks and benefits of using these substances and to seek help if substance abuse becomes a problem.

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o facilitate ease of dose calculations for cefazolin injection, your department policy
states that the resulting concentration after reconstitution should be 100 mg/mL. The
packaging insert for cefazolin 1-g vial instructs you to add 3.4 mL of sterile water without
bacteriostat, resulting in a reconstituted solution of 250 mg/mL
i. What is the final volume of the reconstituted cefazolin solution?
A 3 mL
B. 4 mL
C. 5 mL
D. 2.5 mL

ii. What is the volume of the cefazolin powder?
A 0.4 mL
B. mL
C. 0.7 mL
D. 0.6 mL

iii. What is the final volume of the 100mg/mL cefazolin solution?
A. 6 mL
B. 8 mL
C. 7 mL
D. 10 mL

Answers

The final volume of the reconstituted cefazolin solution is 4 mL.  The volume of the cefazolin powder is 0.6 mL. The final volume of the 100 mg/mL cefazolin solution is 10 mL.

The packaging insert instructs to add 3.4 mL of sterile water without bacteriostat to the 1-g vial of cefazolin. This results in a reconstituted solution with a concentration of 250 mg/mL.

To find the final volume, we can set up the equation:

Concentration of reconstituted solution = Amount of drug / Final volume

Using the given concentration (250 mg/mL) and the amount of drug (1 g = 1000 mg), we can rearrange the equation to find the final volume:

250 mg/mL = 1000 mg / Final volume

Solving for the final volume:

Final volume = 1000 mg / 250 mg/mL = 4 mL

Therefore, the final volume of the reconstituted cefazolin solution is 4 mL.

To find the volume of the cefazolin powder, we need to subtract the volume of sterile water added from the final volume of the reconstituted solution.

Given that 3.4 mL of sterile water is added to the vial, and the final volume of the reconstituted solution is 4 mL, we can calculate the volume of the cefazolin powder as follows:

Volume of cefazolin powder = Final volume - Volume of sterile water added

Volume of cefazolin powder = 4 mL - 3.4 mL = 0.6 mL

Therefore, the volume of the cefazolin powder is 0.6 mL.

To determine the final volume of the 100 mg/mL cefazolin solution, we can use the concentration and the amount of drug.

We are given that the resulting concentration after reconstitution should be 100 mg/mL. Considering the amount of drug is 1 g (1000 mg), we can set up the following equation:

Concentration of reconstituted solution = Amount of drug / Final volume

Using the given concentration (100 mg/mL) and the amount of drug (1000 mg), we can rearrange the equation to find the final volume:

100 mg/mL = 1000 mg / Final volume

Solving for the final volume:

Final volume = 1000 mg / 100 mg/mL

Final volume = 10 mL

Therefore, the final volume of the 100 mg/mL cefazolin solution is 10 mL.

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Other Questions
Fill in with the correct form of ser or estar. Please include the full sentence in your response. Paco y yo___somos______amigos. Yo __estoy_____feliz. T___estas____en la clase de espaol. Vosotros__sois______inteligentes. Ellos_______estan_____cansados. El examen _____es_____fcil. El partido de bisbol ____es______divertido. Juan __________alto. Las chicas________bajas. ________las tres de la tarde. ______el cinco de mayo. _______jueves. Yo _____norteamericano. Nosotros _________de Los Estados Unidos. El concierto _______al estadio(the stadium). _____la primavera. Uds. _________estudiantes. Ella ________profesora. Mis libros________en mi armario. Maria _______chica. Paco _______chico. Yo ________enojado. Paco y Pepe__________amigos. Yo ________bien. Los chicos __________tristes. Nosotros __________simpaticos. Ellos ___________antipaticos. La fiesta _________grande. El perro ________pequeo. La gata _________bonita. 4x(28-10+2) Please help it says the answer is 92, but I keep getting 80. If 92 is the correct answer, please explain Parking lot staff budget Adventure Park is a large theme park. Staffing for the theme park involves many different labor classifications, one of which is the parking lot staff. The parking lot staff collects parking fees, provides directions, and operates trams. The staff size is a function of the number of daily vehicles. Adventure Park has determined from historical experience that a staff member is needed for every 200 vehicles. Adventure Park estimates staff for both school days and nonschool days. Nonschool days are higher attendance days than school days. The number of expected vehicles for each day is as follows: School Days Nonschool Days Number of vehicles per day 3,000 8,000 Number of days per year 165 200 Parking fees are $10 per vehicle. Each parking lot employee is paid $110 per day. Required:a. Determine the annual parking lot staff budget for school days, nonschool days, and total.b. Determine the parking revenue for school days, nonschool days, and total. c. If depreciation expense and other expenses for running the parking lot were estimated to be $2 million per year, determine the parking lot's budgeted profit. The nucleotides on the mRNA will be "read" in the next step to producing a polypeptide. What sequence of bases indicates the starting point for the polypeptide "blueprint"? Any Spanish speakers that can help!! today, you short sold 200 shares of wynot stock at $35 a share. the initial margin is 60 percent and the maintenance margin is 30 percent. which one of the following is correct concerning your account balance sheet for this transaction? a. you have an asset of $4,200 from the sale proceeds. b. you have a liability from the short position of $7,000. c. your initial margin deposit is $3,600. d. your account equity is $11,200. e. your total assets are $20,400. Human Eye ModelExperiment 1: Optics of the Human Eye Part 2: Accommodation In the process of accommodation, muscles in the eye change the shape of the crystal- line lens to change its focal length. Initially, you will model accommodation by vary- ing the focal length of the crystalline lens using the adjustable focus lens. Later, when the model is filled with water, accommodation is achieved by replacing the crystalline lens with fixed lenses of various focal lengths. Procedure Note: If you have not done so yet, follow the instructions of page 5 to fill the adjustable focus lens with water. 1. Do not fill the eye model with water yet. Replace with lens in the SEPTUM slot with the adjustable focus lens. Position the eye model about 25 cm from the illu- minated screen Can you see the image on the retina? Move the syringe plunger to adjust the lens and form the clearest image possible. Is the lens concave or convex? Is it a converging lens or a diverging lens? 2. Move the eye model farther from the illuminated screen to about 50 cm. Adjust the lens again to form the clearest image. Did you increase or decrease the power of the lens? Did you increase or decrease the focal length? 3. Replace the adjustable focus lens with the +400 mm lens in the SEPTUM slot. Adjust the distance of the illuminated screen to form a clear image. Mark the position of the eye model so you can retum it to the same place after you fill it with water. 4. Fill the eye model with water to within 1 or 2 cm of the top. Return it to the same position as in step 3. Is the image still in focus? Try changing the distance, can you get it to focus? Explain what effect do the aqueous and vitreous humors (modeled by the water) have on the focal length of the eye's lens system? 5. Place the eye model about 35 cm from the light source, Replace the +400 mm lens in the SEPTUM slot with the +62 mm lens. Is the image in focus now? Move the eye model as close as possible to the light source while keeping the image in focus. Describe the image on the retina screen 6. Measure the object distance, o, from the screen of the light source to the top rim of the eye model, as pictured below. (The front of the rim is a convenient place to measure to and marks the center of the eye model's two-lens system.) Record this distance, which is the near point of the eye model when equipped with the +62 mm lens. The average human eye has a near point for distinct vision of about 25 cm tak +62 mm Lens research and describe all of the important coastal and marineecosystem goods and services offered by the Canary Current. What is the best description of a food chain?the competition among several species for the same food itemO the transfer of energy from one organism to anothero the way in which a living thing survives in its habitatO the life cycle of the major predator in an ecosystem Find the coordinate matrix of x in Rh relative to the basis B! B' = {(1, -1, 2, 1), (1, 1, -4,3), (1, 2, 0, 3), (1, 2, -2, 0)}; x = (8, 9, -12, 2). Xb'=___ In "A Piece of String," whichof the following excerptscharacterizes MatreHauchecome? Suppose that you draw two cards from a standard deck. a) What is the probability that both cards are Kings, if the drawing is done with replacement? b) What is the probability that both cards are hearts, if the drawing is done without replacement? Natalie found a tennis ball outside a tennis court. She picked up the ball and threw it over the fence into the court.The path of the ball can be represented by the equation h=-16t^2+18t+5. find the maximum height,How long will it take to reach the ground?, and How high in the air will the ball be after 1 second? has anyone watch the movie "searching" what are the main social media's and how they did evolve the story PLS HELP ME Coco is enrolled in University and has just completed Finance where, among other things, she has learnt about the existence of the futures market. Coco has a better understanding of the spot market and she is not quite sure about how investments in the two markets would compare. Building on her knowledge from Principles, Coco would like to invest in the ASX 200, as a broadly diversified portfolio. She approaches her friend Iga and asks her "Should I consider investing in the ASX200 using index futures contracts? Would I get a better or worse return than if I invested through a passive index fund on the ASX?" Iga is also a student at Uni and has successfully completed Derivative Securities. Using her Derivatives expertise, Iga replies: "Well, as long as you hold your, say, long futures position for a relatively short time so that interest rates do not change and the dividend yield does not change, then it doesnt matter which one you choose: the return that you get from your index futures position is going to match the excess return on the index fund over the same time period".Would you agree with Igas argument? Why or why not? Help me solve this spanish questions. 2C4H10 + 13O2 --> 8CO2 + 10H2OWhich is true about the reaction shown above?The reaction has two elements that combine to form a compound.The reaction releases energy.The reaction is a single replacement.The reaction has negative ions in two of the compounds that switch places. 1.1A river profile is ...a) a view of the river channel.b) a view of the watershed.c) a view drainage pattern.d) a view of water table. (Need help pls)!!!!! A single person earned $95,000 in 2018. How much did they pay in taxes? (Use the tax rates presented in Table 3.6) (Do not round intermediate calculations. Round your answer to 2 decimal places.)a. What was their marginal tax bracket?b. What was their average tax bracket?