Question

The formula for the volume of a cylinder with a height of 5 units is V(r)=5(pi)r^2 where r is the radius of the cylinder. What is the domain and range of this function?
r < 0, V(r) < 0
r > 0, V(r) < 0
r < 0, V(r) > 0
r > 0, V(r) > 0

Answer 1

Can the radius be less than 0? Can the volume be less than 0?

Answer 2

Radius cannot be less than zero, and volume cannot be less than zero. Oh! I understand it now.