The correct interpretation for the function notation \( V(3) = 90\pi \) is:
The volume of the cylinder is \( 90\pi \) when the radius is 3.
This means that when you substitute \( r = 3 \) into the volume formula \( V(r) = 10\pi r^2 \), you find that the volume of the cylinder with a radius of 3 inches is \( 90\pi \) cubic inches.