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kolbaska11 [484]
3 years ago
9

What is the area of a circle with a diameter of 8?

Mathematics
1 answer:
sasho [114]3 years ago
6 0

Answer: 16 π

Step-by-step explanation:

The formula for area = π r²

Radius equals one half of the diameter = 8/2 = 4

The formula to solve this problem is

A = 3.14 x 16

A = 50.25

You might be interested in
Let X denote the time from the present until the stock market hits 25,000. If X ≤ 1, you win $10, 000X. If X > 1, you win not
const2013 [10]

Answer: $6321

Step-by-step explanation:

Expected value is given as exactly what you might think it means intuitively, the return you can expect for some type of action.

The basic expected value formula is the probability of an event multiplied by the amount of times the event happens:(P(x) * n).

he formula for the Expected Value for a binomial random variable is:

P(x) * X.

X is the number of trials and P(x) is the probability of success.

The formula for calculating the Expected Value where there are multiple probabilities is:

E(X) = ∑X * P(X)

The equation is basically the same, but here you are adding the sum of all the gains multiplied by their individual probabilities instead of just one probability.

Calculating the expected value of winning as follows:

Given,

Fx= e^-x, x is greater or equal to 0

Now, P less than or equal to zero =

[-e^-x] ^1

e^-0 - e^-1

= 1 - e^-1

= 0.6321

and P(x>1) = 1-0.6321= 0.3679

Therefore,Let y= amount of winnings.

Based on the above given information,

y= $10000 0

P(y)= 0.6321 0.3679

The expected value of winning:

E(y) = ΣyP(y)

E(y) = 10000 × 0.6321 + 0 × 0.3679

E(y) = $6321

Therefore, the expected value of winning is $6321

5 0
3 years ago
Find the slope from an equation ??? Y = -x
lord [1]

Answer:

<h2>The answer is - 1</h2>

Step-by-step explanation:

Equation of a line is y = mx + c

where

m is the slope

c is the y intercept

From the question the equation of the line is

y = - x

Comparing with the general equation of the line

The slope of the line is - 1

Hope this helps you

5 0
3 years ago
In ΔXYZ, ∠Y=90° and ∠X=24°. ∠ZWY=81° and XW=7.1. Find the length of WY to the nearest 10th.
Brums [2.3K]

Answer:

0.5

Step-by-step explanation:

delta math

4 0
3 years ago
How many whole numbers are there, whose squares and cubes have the same number of digits?
Naddik [55]

Answer:

there are only 4 whole numbers whose squares and cubes have the same number of digits.

Explanations:

let 0, 1, 2 and 4∈W (where W is a whole number), then

0^2=0, 0^3=0,

1^2=1, 1^3=1,

2^2=4, 2^3=8,

4^2=16, 4^3=64.

You can see from the above that only four whole numbers are there whose squares and cubes have the same number of digits







7 0
3 years ago
Write the equation of the line passing through the points (-1,2) and (3, 4)
Harlamova29_29 [7]

Answer:

y=2/4x+5/2

Step-by-step explanation:

y=mx+b

2-4/-1-3

-2/-4

Slope =2/4

y=2/4x+b

2=2/4(-1)+b

b=5/2

y=2/4x+5/2

3 0
3 years ago
Read 2 more answers
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