Answer:
A 59 71 83 C 21 23 32
Step-by-step explanation:
The scale factor is:

So you divide the corresponding lengths and the ratio you get is the scale factor. Hope it helps!
I suspect 4/2 should actually be 4/3, since 4/2 = 2, while 4/3 would make V the volume of a sphere with radius r. But I'll stick with what's given:





In Mathematica, you can check this result via
D[4/2*Pi*r^3, r]