What is the volume of a sphere with a diameter of 2 1/2 inches

The formula for volume of a sphere is:

where r is the radius

Since we are not given the radius, we can just cut the diameter in half, which is the equivalent.

We should end up getting a radius of 5/4

We now need to substitude 1.25 for r
 

 

We can change this to 125/64 * 4/3 * π

Simplify further to get 125/16 * 1/3 * π (cross out the 4's)

Multiply and your final volume should be 125/48π in³

2+2-9-$29: ! 3$3$282! 2! 2