y=x, y=x^2, y=x^3, y=|x,| y=1/x, y=x, y=e^x, y=1/1+e^-x, y=ln(x), y=floor(x), y=sinx, y=cosx
12. three functions that are bounded above

Answers

Answer 1

Answer:Three functions that are bounded above are y = x^2, y = x^3, y = e^x.

y = x^2 is a parabola that opens upward and has a vertex at the origin (0,0). As x increases or decreases, y will always be positive and increases or decreases accordingly, so the function is bounded above by positive infinity.

y = x^3 is a cubic function that also opens upward. As x increases or decreases, y will always be positive and increases or decreases accordingly, so the function is bounded above by positive infinity.

y = e^x is the exponential function where e is Euler's number (approximately 2.718). As x increases, y will increase towards positive infinity, so the function is bounded above by positive infinity.

Step-by-step explanation:


Related Questions

Scale 1"=50'.What is the line's actual length?

Answers

The scale of the scale factor for the model to actual is 1 ich = 50 feet.

What is a scale factor?

The scale factor defines a variable in a ratio of two different measurements.

Sometimes drawings of large models are represented in a scale factor of a smaller unit.

Given, The actual length of a model has a scale of Scale 1" = 50'.

So, 1 inch of the model length is equal to 50 feet of actual length.

Therefore, The length of scale for the model to actual is 1 ich = 50 feet.

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What are rational and irrational numbers?

Answers

Answer:

Rational numbers are numbers that can be expressed as a fraction or part of a whole number. (examples: -7, 2/3, 3.75) Irrational numbers are numbers that cannot be expressed as a fraction or ratio of two integers. There is no finite way to express them. ( examples: √2, π, e)

consider the following normal-form game: 2 l c r 1 u 4, 11 3, 5 6, 12 m 2, 4 1, 8 5, 6 d 3, 10 4, 7 3, 8 a. is there a strictly dominant strategy for some player? b. are there strictly dominated strategies for some player? find them all. c. find the set of outcomes that survive the process of iterative elimination of strictly dominated strategies. is the game solvable?

Answers

The probability game is solvable, and Player 1 has a strictly dominant strategy of Left (L), while Player 2 has four strictly dominated strategies. The surviving outcomes are (L, U), (L, M), (L, D), and (L, R).

This normal-form game is solvable, with Player 1 having a strictly dominant strategy of Left (L). Player 1's left strategy is strictly dominant because it will always yield a higher payoff than any other strategy for Player 1, regardless of what Player 2 does. Player 2, on the other hand, has four strictly dominated strategies: Up (U), Middle (M), Down (D), and Right (R). These strategies are strictly dominated because they will always yield a lower payoff than any other strategy for Player 2, regardless of what Player 1 does. The set of outcomes that survive the process of iterative elimination of strictly dominated strategies is (L, U), (L, M), (L, D), and (L, R). In other words, Player 1 will always choose left, and Player 2 will choose either Up, Middle, Down, or Right.

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identify the slope y-intercept and equation of the line given the two points, 0.4 and 2,5

Answers

[tex](\stackrel{x_1}{0}~,~\stackrel{y_1}{4})\qquad (\stackrel{x_2}{2}~,~\stackrel{y_2}{5}) ~\hfill \stackrel{slope}{m}\implies \cfrac{\stackrel{\textit{\large rise}} {\stackrel{y_2}{5}-\stackrel{y1}{4}}}{\underset{\textit{\large run}} {\underset{x_2}{2}-\underset{x_1}{0}}} \implies \cfrac{ 1 }{ 2 }[/tex]

[tex]\begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-\stackrel{y_1}{4}=\stackrel{m}{ \cfrac{ 1 }{ 2 }}(x-\stackrel{x_1}{0})\implies y=\cfrac{1}{2}x+\text{\LARGE 4}~\hfill \stackrel{y-intercept}{(0,\text{\LARGE 4})}[/tex]

Evaluate the iterated integral by converting to polar coordinates
integral(upper=a, lower=0) integral(upper=0, lower= -√(a2-y2)) x2y dx dy

Answers

Integral(upper=a, lower=0) Integral(upper=0, lower=a) r2sinθ dr dθ (1/3)a3sinθ

We can evaluate this iterated integral by converting it to polar coordinates.

The first integral has an upper bound of a and a lower bound of 0. This corresponds to the radial coordinate of r, which has a lower bound of 0 and an upper bound of a. The second integral has an upper bound of 0 and a lower bound of -√(a2-y2). This corresponds to the angular coordinate of θ, which has a lower bound of -π/2 and an upper bound of π/2.

Therefore, the integral in polar coordinates is:

Integral(upper=a, lower=0) Integral(upper=0, lower=a) r2sinθ dr dθ

We can then evaluate this integral by using the formula for the area of a sector:

Area = (1/2)r2θ

Substituting in the upper and lower bounds of the integrals, we get:

(1/2)(a2)(π/2) = (1/3)a3sinθ

Therefore, the answer is (1/3)a3sinθ.

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Please tell me the answer I have 1 more try

Answers

Answer:

4

Step-by-step explanation:

24*1/6=4

Answer:

Your answer is 4

24/6

6×4=24

Solve for X, Leave in simplest radical form.

Answers

Hope it helps.

If you have any query, feel free to ask.

60,
60
60
4cm
Find the shaded portion.

Answers

diameter = 4 x 2 = 8
the area of a circle = pi x r^2 = pi x 8^2 = pi x 64 = 64pi
divide 64pi by two to get the area of the semicircle which is 32pi
area of one of the triangles = 4x4=16/2=8
three circles = 8x3=24
area of shaded = 32pi - 24
32pi = 100.53
100.53-24=76.53

a square is inscribed in a circle with radius 6-/2 inches. what is the perimeter of the square in inches?

Answers

The perimeter of the square is 4*12 inches = 48 inches

To solve for the perimeter of the square inscribed in the circle, we first need to determine the side length of the square. Since the square is inscribed in the circle, the diameter of the circle is equal to the side length of the square.

Given that the radius of the circle is 6*√2 inches, we can find the diameter of the circle by multiplying the radius by 2:

Diameter = 2 * (6√2) inches

Diameter = 12√2 inches

Now that we know the diameter of the circle is equal to the side length of the square, we can find the perimeter of the square by multiplying the side length by 4:

Perimeter = 4 * (12√2) inches

Perimeter = 48√2[tex]\sqrt{2}[/tex][tex]\sqrt{2}[/tex] inches

so the perimeter of the square is 48*√2 inches.

As we know that the square is inscribed in the circle, the diameter of the circle is equal to the diagonal of the square, so the side length of the square is equal to the diameter of the circle divided by sqrt(2) .

Side length = 12*√2 inches /√2

Side length = 12 inches

so, the perimeter of the square is 4*12 inches = 48 inches

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let f be the function given by f(x)= lnx/x for all x>0. the derivative of f is given:
f'(x)= (1-lnx)/x^2
a) write an equation for the line tangent to the graph of f at x=e^2
b) find the x-coordinate of the critical point of f. Determine whether this point is a relative minimum, a relative maximum, or neither. justify your answer.
c) the graph of the function f has exactly one point of inflection. Find the x-coordinate of this point.
d) find thef(x)

Answers

a) To find the equation of the line tangent to the graph of f at x = e^2, we need to find the slope of the tangent line and the y-intercept. The slope of the tangent line is given by the derivative of f evaluated at x = e^2: f'(e^2) = (1 - ln(e^2))/(e^2)^2 = (1 - 2)/e^4 = -1/e^4

The y-intercept is found by plugging x = e^2 into the original function and finding the corresponding y-value: f(e^2) = ln(e^2)/e^2 = 2/e^2

We can use this information to write the equation of the tangent line in point-slope form: y - f(e^2) = -1/e^4(x - e^2)

b) To find the x-coordinate of the critical point of f, we need to find the value of x at which f'(x) = 0 or is undefined.

f'(x) = (1 - lnx)/x^2

When we set f'(x) to 0, we get 1 - lnx = 0 lnx = 1 x = e.

As a result, the critical point is at x = e.To determine whether this point is a relative minimum, a relative maximum, or neither, we need to find the second derivative of f(x) and evaluate it at x = e.

f''(x) = -(1 + lnx)/x^3

Evaluating at x = e, we get: f''(e) = -(1 + ln(e))/e^3 = -(1 + 1)/e^3 = -2/e^3

Since the second derivative is negative, the critical point is a relative maximum.

c) To find the x-coordinate of the point of inflection, we need to find the value of x at which f''(x) = 0.

f''(x) = -(1 + lnx)/x^3

Setting f''(x) = 0, we get 1 + lnx = 0 lnx = -1 x = e^-1

So the point of inflection is at x = e^-1.

d) To calculate f(x) = lnx/x, we need to substitute the value of x into the function. f(x) = lnx/x

For example, if we want to calculate f(2) f(2) = ln(2)/2 = 0.693147180559945/2 = 0.346573590279973

So f(2) = 0.346573590279973


How likely is it for Bryson to choose a number greater than four?

Answers

Answer:

Likely

Step-by-step explanation:

Let's list out all the numbers 1 to 12 first:

1 2 3 4 5 6 7 8 9 10 11 12

Nice! Now let's only keep the numbers that are greater than 4, since the other numbers don't satisfy the condition of "greater than 4"

5 6 7 8 9 10 11 12

There are 8 options that Bryson could choose out of all the 12 options. We can express that as 8 over 12:

[tex]\frac{8}{12}[/tex]

Then, we simplify this by dividing both the numerator and denominator by 4, and we get:

[tex]\frac{2}{3}[/tex]

Therefore, it is a 2/3 chance that Bryson will choose a number greater than 4, and we would say that 2/3 chance is likely, but not certain.

Answer:

1.  59% chance of drawing an odd card.  "As likely as not."

2.  A 66.67% chance of drawing a number greater than 4.  Likely

Step-by-step explanation:

We will assume that all card draws are random, as promised.  

The likihood of drawing an odd number is determined by counting how many numbers in the cards labelled 1 - 12 are odd.  There are 6 odd and 6 even cards.  Bryson's change of picking an odd card, randomly, is 6/12 (6 times out of 12 tries).  That's a 50% chance.  I don't see the options for answers, but "As likely as not" would be correct.  The chance for even is also 6/12, or 50%

To determine the likihood of picking a number great than 4, count the values greater than 4 (5,6,7,8,9,10,11,12)  There are 8 values greater than 4.  Bryson has an 8/12 chance of picking a number greater than 4.  That would mean a 66.666% chjance, which I would consider "likely."

MELTS IN YOUR MOUTH NOT IN YOUR HAND!


Converse:
Inverse:
Contrapositve:


please i need the answer

Answers

Answer:

Greetings!!!

Converse:- MELTS IN YOUR HAND NOT IN YOUR MOUTH!

Inverse:- DOESN'T MELT IN YOUR HAND BUT MELTS IN YOUR HAND!

Contrapositive:- MELTS IN YOUR HAND NOT IN YOUR MOUTH!

Hope it helps!!!

how many dekameters is 4500 centimeters

Answers

Answer:

4.5

Step-by-step explanation:

one decameter is equal to 1000 centimeters 4500/100= 4.5

Which two quadrants contain all of the solutions to the following system?
y > 4x - 2
y > -3x - 5
a. i and ii b. ii and iii c. iii and iv d. i and iv

will mark brainliest
pls help me

Answers

On solving the provided question, we can say that here, inequality value will be x = 1 and y = 1.

What is inequality?

An inequality in mathematics is a relationship between two expressions or values that is not equal. Thus, imbalance leads to inequality. An inequality creates the link between two values that are not equal in mathematics. Egality is distinct from inequality. When two values are not equal, most commonly use the not equal sign (). Different inequalities are used to contrast values, no matter how little or large. Many simple inequalities may be resolved by modifying the two sides until the variables are all that remain. But a number of things contribute to inequality: Negative values on both sides are divided or added. Trade off the left and right.

here,

in this inequality equation

y > 4x - 2

y > -3x - 5

as,

4x-2 > 3x-3

1x > 1

x=1

x=1; y=1

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WILL MAKE BRAINLIEST! Find the solution to the system of equations. Round to the nearest tenth if necessary.

Answers

Answer:

To find the solution to the system of equations, we need to find the values of x and y that make both equations true at the same time.

The pairs of points you provided are coordinates (x,y) which we can use to find the solution.

For the pair of points (1.8, 11.4) and (-2.8, -2.4)

We can substitute the x and y values of the first point into both equations and check if they are true.

f(1.8) = 31.8 + 6 = 7.4

g(1.8) = 1.8^2 + 41.8 + 1 = 11.16

As we can see the first equation is not true, we can safely assume that this is not the solution of the system of equations.

For the pair of points (0,6) and (0, 1)

We can substitute the x and y values of the first point into both equations and check if they are true.

f(0) = 30 + 6 = 6

g(0) = 0^2 + 40 + 1 = 1

As we can see both equations are true at the same time, this is the solution of the system of equations.

For the pair of points (-3.7,0) and (-0.27,0)

We can substitute the x and y values of the first point into both equations and check if they are true.

f(-3.7) = 3*(-3.7) + 6 = -7.1

g(-3.7) = (-3.7)^2 + 4*(-3.7) + 1 = 13.69

As we can see the first equation is not true, we can safely assume that this is not the solution of the system of equations.

For the pair of points (2.8, 5.1) and (3.6, 1.2)

We can substitute the x and y values of the first point into both equations and check if they are true.

f(2.8) = 32.8 + 6 = 11.4

g(2.8) = 2.8^2 + 42.8 + 1 = 21.96

As we can see the first equation is not true, we can safely assume that this is not the solution of the system of equations.

So the solution of the system of equations is (0,6) and (0, 1)

I need the answer to this problem asap

Answers

Answer: well you need to divid

Step-by-step explanation: well by dividing you get a answer so like you compare if the answer you got is for all of them and if it is not you say it is not proportional

Which of the following expressions is equivalent to the expression “eleven from a number”?

“the sum of eleven and a number”
“the difference between a number and 11”
“a number added to 11”
“11 subtracted from a number”
“a number subtracted from 11”
“11 added to a number”
(multi answer)

Answers

The expression is equivalent to the expression (x - 11) will be the difference between a number and 11 and 11 subtracted from a number. Then the correct options are B and D.

What is an equivalent expression?

The equivalent is the expression that is in different forms but is equal to the same value.

The statement is given below.

“Eleven from a number”

Convert the statement into a mathematical form. Let the number be 'x'. Then we have

⇒ x - 11

The expression is equivalent to the expression (x - 11) will be the difference between a number and 11 and 11 subtracted from a number. Then the correct options are B and D.

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Find the selling price of each item.
1) Original price of concert tickets: $124.95
Tax: 2%

Answers

Answer:

$127.47

Step-by-step explanation:

124.95 x .02 = 2.499 Which rounds to 2.50

124.95 + 2.50 = 127.47

You change a percent to a decimal by dividing by 100%

An Isosceles triangle and a square have the same perimeter. Find the side lengths of the triangle.
triangle base: 3x

triangle height: 2x+1

square length: 4

Answer: 5, 5, 6

How you get this answer?

Answers

Well maybe if using this example equation might help you, the picture is below the equation example!

Since an isosceles triangle has two equal sides, its perimeter can be calculated if the base and the equal sides are known. The formula to calculate the perimeter of an isosceles triangle is P = 2a + b where 'a' is the length of the two equal sides and 'b' is the base of the triangle.

This worksheet is a review of circles and lines, and will give you some practice with algebra and with graphing. Also, this worksheet introduces the idea of "tangent lines" to circles. Later on in Math 124, you'll learn how to find tangent lines to many other types of curves. Two circles, called C1 and C2, are graphed below. The center of C_1 is at the origin, and the center of C_2 is the point in the first quadrant where the line y = x intersects C1. Suppose C1 has radius 2. C2 touches the x and y axes each in one point. What are the equations of the two circles?

Answers

The equations of the two circles are (x-0)^2 + (y-0)^2 = 2^2 or x^2 + y^2 = 4 and (x-1)^2 + (y-1)^2 = 1^2 or (x-1)^2 + (y-1)^2 = 1.

The equation of a circle with centre (a,b) and radius r is given by (x-a)^2 + (y-b)^2 = r^2.

C1 has centre (0,0) and radius 2, so its equation is (x-0)^2 + (y-0)^2 = 2^2 or x^2 + y^2 = 4.

C2 touches the x and y axes each in one point, so it must have a centre on the line y=x and a radius equal to the distance from the centre to either of those points of tangency. Since the centre of C2 is on the line y=x and it is in the first quadrant, the coordinates of the centre are (1,1). The distance from the centre to the point of tangency on the x-axis is 1, so the radius is 1. The equation of C2 is (x-1)^2 + (y-1)^2 = 1^2 or (x-1)^2 + (y-1)^2 = 1.

Therefore, The equations of the two circles are (x-0)^2 + (y-0)^2 = 2^2 or x^2 + y^2 = 4 and (x-1)^2 + (y-1)^2 = 1^2 or (x-1)^2 + (y-1)^2 = 1.

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say you continually sample from some i.i.d. uniformly distributed (0, 1) random variables until the sum of the variables exceeds 1. how many times do you expect to sample?

Answers

With m′x=mx, xmx is differentiable. Since m0=1, mx=ex for every x 1 and E(N)=m1=e specifically.

What are random variables?

A quantity or item that depends on random events is formalized mathematically as a random variable, also known as a random quantity, aleatory variable, or stochastic variable.

It is a mapping or function from potential outcomes, such as the potential heads or tails of a coin flip.

This graph demonstrates how random variables are a function of real values and all conceivable outcomes.

It also demonstrates how probability mass functions are defined using random variables.

Informally, randomness usually denotes some basic element of chance, like as the roll of a die, and it may also denote uncertainty, such as measurement mistake.

Hence, With m′x=mx, xmx is differentiable. Since m0=1, mx=ex for every x 1 and E(N)=m1=e specifically.

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at what rate is the angle between a clock's minute and hour hands changing at 10 o'clock in the evening

Answers

Answer:

Step-by-step explanation:

I guess 6%?

A water bottle holds 56oz. Each time Anna takes a sip she drinks 8oz.

a) Write a function to represent the scenario

b) How many sips can Anna take before she needs to refill?

c) Create a graph to represent this situation.

d) What is the domain in set notation of the function?

Answers

Answer:

Step-by-step explanation:

a) The function to represent the scenario is f(x) = 56 - 8x, where x is the number of sips Anna takes.

b) Anna can take 7 sips before she needs to refill.

c)

The graph of the function is given below:

\begin{center}

\begin{tikzpicture}

\begin{axis}[

   axis lines = left,

   xlabel = $x$,

   ylabel = {$f(x)$},

   ymin = 0,

   ymax = 56,

   xtick = {0,1,2,3,4,5,6,7},

   ytick = {0,8,16,24,32,40,48,56}

]

\addplot[

   domain=0:7,

   samples=2,

   color=black,

]

{56 - 8*x};

\end{axis}

\end{tikzpicture}

\end{center}

d) The domain of the function in set notation is {0,1,2,3,4,5,6,7}.

helppppp. I needddddddddd help! Quick

Answers

i think it's a b and e correct me if i'm wrong

the margin of error of a confidence interval is the error from biased sampling methods.T/F

Answers

Considering margin of error only accounts for random sampling errors and not bias, the statement "The margin of error of a confidence interval is the error from biased sampling methods" is false.

A margin of error is a statistical term that takes into account the difference between the outcomes of a random survey sample and the projects outcome. To put it another way, you can determine the degree of unpredictability in data and study results by looking at the margin of error.

Margin of error calculations are based only on the error associated with random samples. It does not account for other possible sources of error such bias in the questions, prejudice owing to eliminating groups that could not be contacted, people refusing to respond or lying, and miscounts and miscalculations.

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at present 1 us dollar can be exchanged with Nepali rupees 120.if Nepali currency is devaluated by 10%how much Nepali currency is needed to exchange 450 us dollar

Answers

48600 rupees is needed to exchange 450 us dollars

What is Percentage Decrease?

Percentage Decrease is the percentage change in the value when it is decreased over a period of time.

How to determine this

When 1 us dollar is exchanged at 120 rupees

And devaluated by 10%

i.e 10% of 120 rupees

= 10/100 * 120

= 1200/100

= 12 rupees devaluated

So, 120 - 12 = 108 rupees can be exchanged

How much is 450 us dollars

Let x represent the number

If 1 us dollars = 108 rupees

450 us dollars = x

x = 450 * 108/1 rupees

x = 48600 rupees

Therefore, 48600 rupees can be exchanged for 450 us dollars

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A greengrocer sold exactly 1600 kg of
vegetables in a week.
40% of this mass was onions. This percentage
is correct to 1 s.f.
a) What is the upper bound for the mass of
onions sold in this week?
b) What is the difference between the upper
bound and the lower bound of the mass of
onions sold in this week?
Give your answers in kilograms (kg).

Answers

Lower bound: a number that is less than or equal to all of the elements in a data collection. Upper bound: a number larger than or equal to every element in a data collection.

What is the best way to explain upper and lower bounds?

A)1600×40%=640

Because of the onion in the

(0- 640)Kg

The upper bound for the mass of

Onion sold is 640 kg

B)The lower bound is the minimum quantity  for sale

The lower limit is the least amount that, when rounded up, equals the estimated value. The upper bound is the minimum possible value that would be rounded up to the next estimated value. A mass of 70 kg, for example, rounded to the closest 10 kg, has a lower bound of 65 kg since 65 kg is the lowest mass that rounds to 70 kg.

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Which are correct representations of the inequality –3(2x – 5) < 5(2 – x)? Select two options.

Answers

Therefore , on solving the provided question we can say that inequality will be  x < 2.2727272727 .

What is inequality?

An inequality in mathematics is a relationship between two expressions or values that is not equal. Thus, imbalance leads to inequality. An inequality creates the link between two values that are not equal in mathematics. Egality is distinct from inequality. When two variables values are not equal, most commonly use the not equal sign (). Different inequalities are used to contrast values, no matter how little or large. Many simple inequalities may be resolved by modifying the two sides until the variables are all that remain. But a number of things contribute to inequality.

Here,

Given :

the inequality will be

=> 3(2x – 5) < 5(2 – x)

=> 6x - 15 < 10-5x

=> 11x < 25

=> x < 2.2727272727

Thus ,

x < 2.27

Therefore , on solving the provided question we can say that inequality will be  x < 2.2727272727 .

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The complete question is " Which are correct representations of the inequality –3(2x – 5) < 5(2 – x)? Select two options. x < 5 –6x – 5 < 10 – x –6x + 15 < 10 – 5x A number line from negative 3 to 3 in increments of 1. An open circle is at 5 and a bold line starts at 5 and is pointing to the right. A number line from negative 3 to 3 in increments of 1. An open circle is at negative 5 and a bold line starts at negative 5 and is pointing to the left. "

In the us, 21% of households use a clothesline to dry their laundry. capucine would like to survey households that use a clothesline, so she plans to contact randomly selected us households until she finds ones that use one. let f be the number of households capucine contacts to reach the first household that uses a clothesline. find the mean and standard deviation of f. find the mean and standard deviation of f

answer: mean: 4.84
standard deviation: 4.24

Answers

The mean is 4.8, and the standard deviation is 4.2 if 21% of households use a clothesline to dry their laundry. Capuchin would like to survey households that use a clothesline.

It is defined as the measure of data disbursement, It gives an idea about how much is the data spread out.

Let's suppose the x is the number of households to get the first that uses a clothesline

And p is the probability of a household using the clothesline

X ~ Geo (p = 0.21)

Mean = 1/p

Mean = 4.76 ≈ 4.8

Variance = q/p²

q = 1 - p

Variance = 17.9138

Standard deviation = √Variance

Standard deviation = 4.23 ≈ 4.2

Thus, the mean is 4.8, and the standard deviation is 4.2 if 21% of households use a clothesline to dry their laundry. Capuchin would like to survey households that use a clothesline.

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suppose you plan a survey of starting salaries for recent liberal arts major graduates from your college. from a pilot study you estimate the standard deviation is about 9000. what sample size do you need to have a margin of error equal to 400 with a 90% confidence level?

Answers

You need a sample size of at least 1612 recent liberal arts major graduates to have a margin of error of 400 with a 90% confidence level.

What is standard deviation ?

The standard deviation is a measure of the spread or dispersion of a set of data. It is a statistical measure that describes how much variation or deviation there is from the mean (average) of a set of values. The standard deviation is calculated by taking the square root of the variance, which is the average of the squared differences of each value from the mean.

n = (z*sigma / E)^2

where , n = sample size

z = the z-score corresponding to the desired level of confidence (90% confidence level corresponds to a z-score of 1.645)

sigma = the estimated standard deviation of starting salaries (9000)

E = the desired margin of error (400)

Plugging in the known values ,

n = (1.645 * 9000 / 400)^2

n ≈ (40.1125)^2

n ≈ 1611.6

So you need a sample size of at least 1612 recent liberal arts major graduates to have a margin of error of 400 with a 90% confidence level.

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