The formula for the volume of a sphere is v=4/3πr³ find the radius, to the nearest hundredth, of a sphere with a volume of 15in³.
check my work ! i got 2.17 as radius.

Your mistake is that the 3rd power is not for the 15, that is just to show units
that is cubic inches
you should have done
15=(4/3)pir^3 then solved
anyway

15=4/3pir^3
45=4pir^3
11.25=pir^3
(11.25/pi)=r^3
cube root both sides
1.52992=r

answer is 1.53 in

If you make it a little more clear i can answer it