The function \( V(r) = 10\pi r^2 \) represents the volume of a cylinder with a height of 10 inches and a radius \( r \).
When you evaluate the function at \( r = 3 \), that is \( V(3) \), you are finding the volume of a cylinder that has a radius of 3 inches.
The expression \( V(3) = 90\pi \) indicates that the volume of the cylinder with a radius of 3 inches is \( 90\pi \) cubic inches.
In summary, the correct interpretation of the function notation \( V(3) = 90\pi \) is that the volume of the cylinder with a radius of 3 inches is \( 90\pi \) cubic inches.