Question

Fan and Medal
https://i.gyazo.com/5d291f25e8629d9269b1148a4acfdbcc.png
How do I get the answer? I've tried using the volume sphere formula but none of these answers are working.

Answer 1

its A

Answer 2

How'd you get the answer?

Answer 3

You use a reverse volume formula. The formula for volume of a sphere is
\[V=\frac{ 4 }{ 3 }\times \pi \times r^2\]
So, we set it up like,
\[4500=\frac{ 4 }{ 3 }\times r^2\]
Now, solve

Answer 4

that should be r^3 not r^2

Answer 5

So thats why it would be 60, right?

Answer 6

And thank you!!

Answer 7

Wait no - 15?

Answer 8

Hmm... Hold on...

Answer 9

I am getting a decimal...

Answer 10

Let me try filling in our answer choices...