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2 years ago

Find the area of the circle. Leave your answer in terms of π.

Mathematics

2 answers:

jeka942 years ago

6 0

Answer:

254.47

Step-by-step explanation:

the area of a circle can be found using the formula

pi(radius)^2

in your problem, the radius is 9. Plug it into the equation

pi(9)^2

9^2 is 81

81(pi)

pi is about 3.14

area is 254.47

If you need help, feel free to message me

vova2212 [387]2 years ago

5 0

Answer:

81 $\pi$

Step-by-step explanation:

A= $\pi$ r²

A= $\pi$ 9²

A=81 $\pi$

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What is the solution to he equation (y/y-4)-(4/y+4)=3^2/y^2-16

kicyunya [14]

Answer:

$y=\pm i \sqrt{7}$

Step-by-step explanation:

Given equation is $\frac{y}{\left(y-4\right)}-\frac{4}{\left(y+4\right)}=\frac{3^2}{(y^2-16)}$

Factor denominators then solve by making denominators equal

$\frac{y}{\left(y-4\right)}-\frac{4}{\left(y+4\right)}=\frac{3^2}{(y^2-16)}$

$\frac{y}{\left(y-4\right)}-\frac{4}{\left(y+4\right)}=\frac{9}{(y+4)\left(y-4\right)}$

$\frac{y\left(y+4\right)-4\left(y-4\right)}{\left(y-4\right)\left(y+4\right)}=\frac{9}{(y+4)\left(y-4\right)}$

$y\left(y+4\right)-4\left(y-4\right)=9$

$y^2+4y-4y+16=9$

$y^2=9-16$

$y^2=-7$

take squar root of both sides

$y=\pm \sqrt{-7}$

$y=\pm i \sqrt{7}$

Hence final answer is $y=\pm i \sqrt{7}$ .

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solmaris [256]

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Answer:

Step-by-step explanation:

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