Answer:
28940.568
Step-by-step explanation:
x=10
7x+70=16x-20
70=9x-20
9x=90
divide by 3.14 on both sides first.
V/3.14 = r^3
Now cube root both sides.
3√(V/3.14) = r
r = 3√(V/3.14)
r is the cube root of v/3.14.