Question

*** PLEASE HELP IM TIMED

Answer 1

The first one because it’s the actual formula for a sphere and it has pie at the end because we are solving for a sphere

Answer 2

Archimedes solved this in his famous book Sphere and Cylinder in 225 BC.  The result is reportedly on his tombstone.

The ratio of the volume of the radius r sphere to the cylinder radius r, height 2r is

$\dfrac 2 3$

The same ratio is the ratio of the surface area of the sphere to that of the cylinder (including the ends).

Answer: Last choice