PLS HELP!!!!!!!!!!!!!!!! I got all the way to 4 x \sqrt{6250 is that right or what?

Question

PLS HELP!!!!!!!!!!!!!!!!
I got all the way to 4 x
`\sqrt{6250` is that right or what?

Answer 1

No its not right :(

The correct answer should be 100 root 10, or around 316.23