The correct interpretation for the function notation \( V(3) = 90\pi \) is:
The volume of the cylinder is 90π when the radius is 3.
This means that when you substitute the radius \( r = 3 \) into the volume function \( V(r) = 10\pi r^2 \), you calculate the volume as \( V(3) = 10\pi(3^2) = 10\pi(9) = 90\pi \).