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2 years ago

A circle has a radius of 8cm. What is the AREA? Use this formula - A = pi X radius squared.

Mathematics

1 answer:

Studentka2010 [4]2 years ago

3 0

Step-by-step explanation:

The formula for the area of a circle: $A=\pi r^{2}$

Given:

Radius = 8 cm

Substitute 8 for r (radius):

$A=\pi 8^{2}$

Solve:

$A=\pi (64)$

$A=64\pi$ $or$ $201.062 cm^{2}$ $rounded.$

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Hello,
To solve this function for f(4) we need to plug 4 into f(x) and the result will be our answer. We know that f(x) is $3x^2-7$ . Plugging in 4 we get $3(4)^2-7=41$ . Therefore, f(4)=41. Hope this helps!

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3 years ago

The rectangle below has an area of 81-x^2 square meters and a width of 9-x meters. What expression represents the length of the

oksian1 [2.3K]

For this case we have that by definition, the area of a rectangle is given by:

$A = w * l$

Where:

w: Is the width of the rectangle

l: is the length of the rectangle

According to the data of the statement we have:

$A = 81-x ^ 2\\w = 9-x$

So, the length is given by:

$l = \frac {A} {w}\\l = \frac {81-x ^ 2} {9-x}$

We factor the numerator:

$l = \frac {(9 + x) (9-x)} {9-x}$

We simplify:

$l = 9 + x$

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2 years ago

Rewrite the equation below so that it does not have fractions.

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3 years ago

Caleb has an offer from a credit card issuer for 0% APR for the first 30 days and 17.68%

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Solution:- Answer is 19.33%

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Here Caleb has an offer from a credit card issue for i=0% APR for the first 30 days.

now, effective interest rate for n= 30 days

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now the effective interest rate for n=335 days

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So fourth option is correct.

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