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3 years ago

What is the answer for r? 13=r/9+8

2 answers:

7 0

13 = r/9 + 8

Subtract 8 from the both sides,
5 = r/9

Now, multiply both sides by 9,
45 = r

In short, Your Answer would be 45

Hope this helps!

Pepsi [2]3 years ago

6 0

13 = r/9 + 8

subtract 8 from each side

5 = r/9

multiply 9 from each side

r = 45

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2z^7 the first choice

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0.82%

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3 years ago

What is the area of a circle whose equation is (x-3)² + (y + 1) ² =81?

kupik [55]

Okay, first, given the equation, we need to find out what the radius of the circle is. Let us state the general equation of a circle:

$\frac{(x-x_{1})^2}{r^2}+ \frac{(y-y_{1})_^2}{r^2}=1$

Where $(x_{1}, y_{1})$ is the centre of the circle. In this case, we don't need to know the centre. Just the radius.

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$\frac{(x-3)^2}{81}+ \frac{(y+1)^2}{81}=1$

Great! We now know the radius of the circle. It is $\sqrt{81}$ because it is the bottom fraction. Now we know that the radius is 9.

So now lets input this into the area of circle formula:

$A=πr^2$

Now we insert our radius.

$A=9^2π$

$=A=81π$

You can convert that into a decimal if you wish.

Hope this helped!

~Cam943, Moderator

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3 years ago