A sample size of 669 is required to be 99% confident that the estimate of the percentage of people with headaches who prefer this particular brand of painkiller is within 2 percentage points.
To determine the sample size required to estimate the percentage of people with headaches who prefer a particular brand of painkiller with a 99% confidence level and a margin of error of 2 percentage points, we can use the formula for sample size calculation for proportions.
The formula is given by:
[tex]n = (Z^2 * p * (1 - p)) / E^2[/tex]
Where:
n = required sample size
Z = Z-score corresponding to the desired confidence level (in this case, for a 99% confidence level, Z = 2.576)
p = estimated proportion (we can use the proportion from the initial sample, which is 85/400 = 0.2125)
E = margin of error (0.02 or 2 percentage points)
Substituting the values into the formula:
[tex]n = (2.576^2 * 0.2125 * (1 - 0.2125)) / 0.02^2[/tex]
Calculating the expression:
n = 668.34
Rounding up to the nearest whole number, the required sample size is 669.
Therefore, a sample size of 669 is required to be 99% confident that the estimate of the percentage of people with headaches who prefer this particular brand of painkiller is within 2 percentage points.
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Please just give me the answer
9514 1404 393
Answer:
8
Step-by-step explanation:
The Pythagorean theorem tells you of the relation ...
x² + 6² = 10² . . . . . . . . . squares of sides total to the square of hypotenuse
x² = 100 -36 = 64 . . . . . subtract 6²
x = √64 = 8 . . . . . . . . . . square root
The length of side x is 8 units.
How many solutions does the system have?
You can use the interactive graph below to find the answer.
\begin{cases} x+2y=2 \\\\ 2x+4y=-8 \end{cases}
⎩
⎪
⎪
⎨
⎪
⎪
⎧
x+2y=2
2x+4y=−8
Choose 1 answer:
Choose 1 answer:
(Choice A)
A
Exactly one solution
(Choice B)
B
No solutions
(Choice C)
C
Infinitely many solutions
How many solutions does the system have? ⎧
x+2y=2
2x+4y=−8
Answer:
No solution
Step-by-step explanation:
The easiest approach here is to divide the second equation by 2: x + 2y = -4.
Comparing the first equation with this result, we see that the the two lines never intersect, and thus that there is no solution.
solve the system of differential equations. = 2x 3y 1 = -x - 2y 4
The given system of differential equations is:
dx/dt = 2x + 3y
dy/dt = -x - 2y + 4
To solve this system, we can use various methods such as substitution, elimination, or matrix methods. Let's use the matrix method.
First, we can rewrite the system in matrix form:
d/dt [x y] = [2 3] [x] + [1]
[-1 -2] [y] + [4]
Next, we define A as the coefficient matrix [2 3; -1 -2], X as the column matrix [x; y], and B as the column matrix [1; 4]. The system can now be written as:
dX/dt = AX + B
To find the solution, we can calculate the eigenvalues and eigenvectors of matrix A. From the eigenvalues, we determine the corresponding eigenvectors and use them to construct the general solution. However, without the specific values of matrix A, it is not possible to provide the exact solution.
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HW: using trigonometric identities, show that the solution of the damped forced oscilla from can be written as: (24) Xlt)=12 Fo/m Sin (wo-w)t sin (wotw)t 7 Wo² - w² 2 2 Hint: ure the identifies for addition and Substraction of angles.
Hence, the required equation is `(24) Xlt)=12 Fo/m Sin (wo-w)t sin (wotw)t 7 Wo² - w² 2 2`.
Given damped forced oscillation equation is,`m d²x/dt² + c dx/dt + kx = Fo sin(wt)`Using trigonometric identities, we can write solution for the given damped forced oscillation equation as,X(t) = Acos(wt + Φ) + Xpwhere Xp = (Fo/k) sin(wt - δ)Let's substitute X(t) in the given equation to get the required equation.```
X(t) = Acos(wt + Φ) + Xp
=> dX(t)/dt = -Awsin(wt + Φ) + (Fo/k)wcos(wt - δ)
=> d²X(t)/dt² = -Aw²cos(wt + Φ) - (Fo/k)w²sin(wt - δ)
```Now, substitute these values in the given damped forced oscillation equation.`md²X(t)/dt² + cdX(t)/dt + kX(t) = Fo sin(wt)`⇒ `m(-Aw²cos(wt + Φ) - (Fo/k)w²sin(wt - δ)) + c(-Awsin(wt + Φ) + (Fo/k)wcos(wt - δ)) + k(Acos(wt + Φ) + (Fo/k)sin(wt - δ)) = Fo sin(wt)`Grouping the terms of sines and cosines, we get⇒ `{-Aw²mcos(wt + Φ) + Awcsin(wt + Φ) + (Fo/k)w²sin(δ) + kAcos(wt + Φ) + (Fo/k)wcos(δ)} = Fo sin(wt) - c(Fo/k)wcos(wt - δ)`Let's solve these equations for `δ` and `A`.```
-Aw²mcos(wt + Φ) + Awcsin(wt + Φ) + kAcos(wt + Φ) = 0 .....................(1)
(Fo/k)w²sin(δ) + (Fo/k)wcos(δ) = Fo sin(wt) - c(Fo/k)wcos(wt - δ) .....(2)
```Squaring and adding both equations, we get,`(Aw)²m + kA² = (Fo/k)²`or `A = Fo/(k² - mω²)^(1/2)`From equation (1), we have,`(Aw)²m + kA² = 0`or `δ = tan⁻¹(Aw/k)`Substitute values of A and δ in equation (2), we get,`Xp = (Fo/k) sin(wt - δ) = Fo/(k² - mω²)^(1/2) sin(wt - tan⁻¹(Aw/k))`Therefore, solution for the given damped forced oscillation equation is,`X(t) = Acos(wt + Φ) + Xp`= `12 Fo/m Sin (wo-w)t sin (wotw)t / (wo² - w²)²`
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Select all that apply. Which numbers are not perfect squares? 36 14 20 16 25 18 24
Answer:
20, 18, 14, and 24 are all not perfect squares
Step-by-step explanation:
You are charged $16. 05 after tax for a meal. Assume sales tax is 7%, what was the menu price for the meal
Answer:
$15
Step-by-step explanation:
107% is the price of $16.05
so, 107% = $16.05
Divide both sides by 107:
1% = $0.15
Multiply both sides by 100:
100% = $15.00
A submarine began at sea level and descended toward the ocean floor at a rate of −0.015 km per minute. Its final depth was −0.3675 km. Estimate how long it took the submarine to reach its final depth by rounding the dividend and divisor to the nearest hundredth.
Estimate of the quotient:
Answer:
Around 24.5 minutes
Step-by-step explanation:
Answer:
Estimate of the dividend: -0.37
Estimate of the divisor: -0.02
Estimate of the quotient: 18.5
Step-by-step explanation:
I did the test and it was right and I dubble checked it to
A polygon has the following coordinates: A(-5,2), B(-2,-2), C(2,3), D(6,3), E(6,-5), F(-5,-5). Find the length of EF.
A.
12 units
B.
9 units
C.
11 units
D.
10 units
Answer:
C
Step-by-step explanation:
got it right on edg
help please! :)) ill do whatever it is that gets you guys points!!! please help!
Answer:
7.5 in.
Step-by-step explanation:
Answer:
7.5 in
Step-by-step explanation:
using pythagorean theorem
Hyp²= Opp² + Adj ²
where 9= hyp
5= adj
and x = opp
9²=x²+5²
81=x² + 25
collect like terms
81-25=X²
56=X²
since we're looking for X and not X²
we square root both sides
√x²=√56
x=7.483 approximately 7.5
Please answer if your know
Answer:
52 pounds
Step-by-step explanation:
52 pounds
5 x 100 = ? for easy points
Answer:
500! Just multiply 5 x 1 then add the remaining 2 zeros :)
Step-by-step explanation:
Thank you!
Answer:
[tex]\huge\boxed{\boxed{\underline{\textsf{\textbf{Answer}}}}}[/tex]
[tex]5 \times 100 \\ = 500[/tex]
꧁❣ ʀᴀɪɴʙᴏᴡˢᵃˡᵗ2²2² ࿐
how do you determine if a relation is a function
Answer:
Identify the output values. If each input value leads to only one output value, classify the relationship as a function. If any input value leads to two or more outputs, do not classify the relationship as a function.
Step-by-step explanation:
Holly Krech is planning for her retirement, so she is setting up a payout annuity with her bank. She wishes to receive a payout of $1,800 per month for twenty years. She must deposit $218,437.048 and the total amount that Holly will receive from her payout annuity will be $432,000.
A. How large a monthly payment must Holly Krech make if she saves for her payout annuity with an ordinary annuity, which she sets up thirty years before her retirement?
B. how large a monthly payment must she make if she sets the ordinary annuity up twenty years before her retirement?
A. To save for her payout annuity with an ordinary annuity set up thirty years before her retirement, Holly Krech must make a monthly payment of $175.97.
B. If she sets up the ordinary annuity twenty years before her retirement, Holly Krech must make a monthly payment of $432.00.
What is the monthly payment required for an ordinary annuity set up 30 years before retirement?To calculate the monthly payment for an ordinary annuity set up thirty years before retirement, we can use the formula for the present value of an ordinary annuity. Given the deposit amount of $218,437.048 and the total amount received from the annuity of $432,000, and solving for the monthly payment, we find that Holly must make a monthly payment of $175.97.
How much must be paid monthly for an ordinary annuity set up 20 years before retirement?For an ordinary annuity set up twenty years before retirement, we use the same formula for present value. With the deposit amount and total amount received unchanged, we solve for the monthly payment, which comes out to be $432.00.
It's important to note that the monthly payment increases when the annuity is set up closer to the retirement date. This is due to the shorter time period available for saving, resulting in a higher required contribution to reach the desired payout amount.
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Will mark brainliest for the **CORRECT** answer!
Answer:
4x + 12x = 320
16x = 320
x = 20
Step-by-step explanation:
This is because the diagram shows 4x + 12x and the total being, 320.
4x + 12x = 16x
and 320/16 = 20
so x = 20
hope this helped :)
I’m not sure how to do this someone explain please
Pictures listed in order... from A-C
Which table represents a quadratic function? No downloadable links or files, I will mark brainliest.
It is not the 3rd option.
Answer:
where is the table lol
Given the following function, find the integral s voix by substitution : integral 3 (x-2 ] 3 +4 dx by substitution sinhy=3(x-2)
The simplified expression of integral 3 (x-2 ] 3 +4 dx is (A/3) + 12tanh[tex](sinh^{(-1)}[/tex](3(x-2))) + B
How to find the integral ∫3(x-2)³+4 dx using the substitution sinh(y) = 3(x-2)?To find the integral ∫3(x-2)³+4 dx using the substitution sinh(y) = 3(x-2), we can start by differentiating both sides of the equation with respect to x to find the differential of y:
d(sinh(y))/dx = d(3(x-2))/dx
cosh(y) * dy/dx = 3
dy/dx = 3/cosh(y)
Now, let's solve for dx in terms of dy:
dx = (cosh(y)/3) dy
Substituting this value of dx in the integral:
∫3(x-2)³+4 dx = ∫(3/cosh(y)) * (3(x-2)³+4) dy
Now, we need to substitute the expression for x in terms of y using the given substitution:
3(x-2) = sinh(y)
x - 2 = sinh(y)/3
x = sinh(y)/3 + 2
Substituting this in the integral:
∫(3/cosh(y)) * (3((sinh(y)/3 + 2) - 2)³+4) dy
Simplifying:
∫(3/cosh(y)) * (sinh(y)³+4) dy
To integrate the expression ∫(3/cosh(y)) * (sinh(y)³+4) dy, we can simplify it first:
∫(3/cosh(y)) * (sinh(y)³+4) dy = 3∫(sinh(y)³/cosh(y)) dy + 12∫(1/cosh(y)) dy
To integrate the first term, we can use the substitution u = cosh(y), which implies du = sinh(y) dy:
3∫(sinh(y)³/cosh(y)) dy = 3∫(u³/u) du = 3∫(u²) du = u³/3 + C
For the second term, we can directly integrate 1/cosh(y) using the identity sech²(y) = 1/cosh²(y):
12∫(1/cosh(y)) dy = 12∫sech²(y) dy = 12tanh(y) + D
Now, substituting back y = [tex]sinh^{(-1)}(3(x-2))[/tex]:
u = cosh(y) = cosh[tex](sinh^{(-1)}(3(x-2))[/tex]) = √(3(x-2)² + 1)
Thus, the integral becomes:
∫(3/cosh(y)) * (sinh(y)³+4) dy = (u³/3 + C) + 12tanh(y) + D
Substituting back u = √(3(x-2)² + 1):
= (√(3(x-2)² + 1)³/3 + C) + 12tanh(y) + D
= (√(3(x-2)² + 1)³ + 3C)/3 + 12tanh(y) + D
= (√(3(x-2)² + 1)³ + 3C)/3 + 12tanh[tex](sinh^{(-1)}(3(x-2)))[/tex] + D
To simplify the expression and combine constants, let's assume (√(3(x-2)² + 1)³ + 3C)/3 = A, and 12D = B.
The simplified expression becomes:
(A/3) + 12tanh[tex](sinh^{(-1)}[/tex](3(x-2))) + B
Since [tex]sinh^{(-1)}(3(x-2))[/tex] is the inverse hyperbolic sine function, we can simplify it using the identity sinh[tex](sinh^{(-1)}(x))[/tex] = x:
(A/3) + 12tanh(3(x-2)) + B
This is the simplified form of the integral ∫(3/cosh(y)) * (sinh(y)³+4) dy after combining constants and simplifying the expression.
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6. Brandon and Charlotte Snifflesworth are visiting three of Americas top tourist attractions. The Snifflesworths
live close to Disney World in Orlando, Florida. They decided to start their trip at Disney World before traveling to
San Francisco, California to see the Golden Gate Bridge and then to Minneapolis, Minnesota to go shopping at the
Mall of America. The bearing from Disney to the Golden Gate Bridge is North 65° West. The bearing from the
Golden Gate Bridge to the Mall of America is North 80° East. The bearing from Disney to the Mall of America is
North 30° West and the distance traveled is 1,320 miles. Find all missing interior angles and distances created from
their triangular trip to America's top tourist attractions. Also find the bearing from the Mall of America to
Disneyland.
Answer:
The distance from Disney to the Golden Gate Bridge is 2,162.56 miles
The distance from Mall of America to The Golden Gate Bridge is 1,320 miles
The interior angle at The Golden Gate Bridge is 35°
The interior angle at Mall of America is 110°
The interior angle at Disney is 35°
The direction from Mall of America to Disney is South 30° East
Step-by-step explanation:
The bearing from Disney to the Golden Gate Bridge = North 65° West
The bearing from the Golden Gate Bridge to the Mall of America = North 80° East
The bearing from Disney to the Mall of America = North 30° West
The distance from Disney to the Mall of America = 1,320 miles
Let 'A', 'B', and 'C' represent the interior angles at Disney, The Golden Gate bridge and Mall of America respectively
From the drawing of the triangular trip, we find that the interior angle at C = The sum angles complementary to the bearings at B and at C
Therefore, the interior angle at C = (90° - 65°) + (90° - 80°) = 35°
The interior angle at B = The bearing of C from B - The bearing of A from B
∴ The interior angle at B = 65° - 30° = 35°
B = 35°
∠C = 35° and ∠B = 35°, therefore, the triangle is an isosceles triangle
The interior angle at A = 180° - (∠B + ∠A) = 180° - (35° + 35°) =110°
CA = AB = 1.320
By sine rule, a = sin(110) × 1320/sin(35) ≈ 2,162.56 miles
a = CB = 2,162.56 miles
Therefore, we have;
The distance from Disney to the Golden Gate Bridge = 2,162.56 miles
The distance from Mall of America to The Golden Gate Bridge = 1,320 miles
The interior angle at The Golden Gate Bridge = 35°
The interior angle at Mall of America = 110°
The interior angle at Disney = 35°
The magnitude of the bearing of Mall of America to Disney = The magnitude of the alternate angle to the bearing of Disney to Mall of America = 30°
∴ The direction from Mall of America to Disney = South 30° East
in HIJ the measure of J=90 feet, JH=81 feet, HI=9 feet. Find the measure of I to the nearest degree. (Please answer how you got this answer)
Answer:
63°
Step-by-step explanation:
1) Examing that right triangle, we can find the value of the angle x starting by using a trig ratio and then its reciprocal. Like this:
sin( x ) = 81/91
x = arcsin (81/91)
x = 62.88 = 63
Notice we have the opposite leg and the hypotenuse, so we started with the sine. And to find the value of the angle the arcsin.
2) So, that angle x is 63° (rounding off to the nearest degree)
If y varies inversely with x, and y= 12 when x = 16, what is the constant of variation k?
Answer:
k = 192
Step-by-step explanation:
Given that,
y varies inversely with x. It can be written as :
[tex]y=\dfrac{k}{x}[/tex]
Where
k is the constant of variation
Put x = 16 and y = 12 in the above formula.
[tex]k=yx\\\\k=16\times 12\\\\k=192[/tex]
So, the value of the constant of variation is equal to 192.
You know this??????????????
Answer:
y=x+15
Step-by-step explanation:
Will mark brainliest !!!
Answer:
27
Step-by-step explanation:
Length * width * height to find the volume so it is 3*3*3=27
At a particular restaurant, each mini hotdog has 100 calories and each slider has 200 calories. A combination meal with mini hotdogs and sliders is shown to have 1200 total calories and 4 times as many mini hotdogs as there are sliders. Graphically solve a system of equations in order to determine the number of mini hotdogs in the combination meal, x,x, and the number of sliders in the combination meal, yy.
Answer:
The number of sliders is 2 and the number of hot dogs is 8.
Step-by-step explanation:
Since at a particular restaurant, each mini hotdog has 100 calories and each slider has 200 calories, and a combination meal with mini hotdogs and sliders is shown to have 1200 total calories and 4 times as many mini hotdogs as there are sliders, in order to determine the number of mini hotdogs in the combination meal, X, and the number of sliders in the combination meal, Y, the following calculation must be performed:
2X + Y = 1200
800 + 400 = 1200
800/100 = 8
400/200 = 2
Thus, the number of sliders is 2 and the number of hot dogs is 8.
The distance between bases on a baseball field is 27.43 meters. Joe has jogged from one base to the next 4.5 times. How far has he jogged?
a. 12.48 meters
b. 40.72 meters
c. 123.43 meters
d. 123.45 meters
Number of meters Joe jogged is 123.43 meters. Therefore, the correct answer is option C.
Given that, the distance between bases on a baseball field is 27.43 meters.
Joe has jogged from one base to the next 4.5 times.
Number of meters Joe jogged = Distance between bases on a baseball field × Number of times Joe jogged
= 27.43 × 4.5
= 123.43 meters
Therefore, the correct answer is option C.
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The sixth grade art students are making a mosaic using tiles in the shape of triangles.Each tile Hans leg measures of 7cm and 4cm. If there are 84 tiles in the mosaic,what I sent the area of the mosaic
Answer:
1,176 square centimeters
Step-by-step explanation:
The computation of the area of the mosaic is shown below:
As we know that
The Area of the triangle is
= 1 ÷ 2 × base × height
= 1 ÷ 2 × 7 × 4
= 14
Now 1 tile would be 14 square centimeters
And, there are 84 tiles in the mosaic
So, the total area is
= 84 × 14
= 1,176 square centimeters
A cylinder containing water is fitted with a piston restrained by an external force that is proportional to cylinder volume squared (P = cvc is constant). Initial conditions are 120°C, 90% quality and a volume of 200 L. A valve on the cylinder is opened and additional water flows into the cylinder until the mass inside has doubled. If at this point the pressure is 300 kPa. What is the final temperature, show your solution
The final temperature of the cylinder is -148.68 °C .
To find the final temperature
Let the final temperature be T₂.
Let the final volume be V₂.
The mass of water inside the cylinder at initial conditions, m₁ = ρV₁
On opening the valve, the water enters the cylinder until the mass doubles. So the mass of water inside the cylinder after the valve is opened, m₂ = 2ρV₁
The pressure and mass are related by the equation, PV = mRT
On simplifying the equation we get,
P = (m/ρ) * RTSo Pρ = mRT ………… (1)
From equation (1),
P₁ρ₁ = m₁R T₁
Substituting the values in equation (1) for final conditions,
P₂ρ = m₂R T₂
We need to find T₂
So, T₂ = (P₂ρ/m₂) * R = (300000 N/m² * 1000 kg/m³)/[2 * 1000 kg] * 8.314 J/(mol K)
= 124.47 K or -148.68 °C
So, -148.68 °C is the final temperature approximately.
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) Which relation is a function?
A) y2- x = 8
B) y2 + 3xy = 9y
C) y2 + x = 8x - 8
D) y =3/y- x2
Answer:
It is A
Step-by-step explanation:
If the y2 get subtracted by the 8 then itll be 8
The
ratio of votes in favor to votes against in an election is 5 to 4.
How many total votes were cast if there are 2,620 votes in
favor?
Total votes were casted in election are 4716
Given: The ratio of votes in favor to votes against in an election is 5 to 4. 2,620 votes are in favor.
To find: The total number of votes cast.
Let the number of votes against is 4x.
Given the ratio of votes in favor to votes against is 5 : 4
Then, the number of votes in favor is 5x.
According to the question, 2,620 votes are in favor.
So, 5x = 2,620x = 2,620/5x = 524
The number of votes against = 4x = 4 × 524 = 2096
The total number of votes cast = votes in favor + votes against= 2620 + 2096= 4716
Therefore, there were 4716 votes cast in the
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Diane has $334 in her checking account. She writes a check for $112, makes a deposit of $100, and then writes another check for $98. Find the amount left in her account.
Select one:
a. $444
b. $214
c. $224
d. $86
Answer:
334 - 112 + 100 - 98
Step-by-step explanation:
Tell whether the ordered pair is of liner equations (5,-6) 6x+3y=12 4x+y=14
Answer:
The ordered pair is one of the solution to the system of equations. See below.
Step-by-step explanation:
To tell if the ordered pair is the solution to the system of equations or not, we can do by substituting the ordered pair in both equations.
(x, y) = (5,-6)
Substitute x = 5 and y = -6 in both equations.
First Equation
6x+3y=12
6(5)+3(-6)=12
30-18=12
12=12
Second Equation
4x+y=14
4(5)-6=14
20-6=14
14=14
Because both equations have same sides which mean that both equations are true for (5,-6). Therefore (5,-6) is part of the equations.