A cement truck pours cement into a container in the shape of a cylinder with a radius of 4 feet. The height, h, of the cement in the

container increases at a rate of approximately 10 inches per

minute. Write an equation that models the volume, V, of the

cement in the container in terms of h, then use the equation to

determine the time at which the volume is 8070 cubic feet.

Note that the volume of a cylinder is V = arah, where r and h

are the radius and height of the cylinder. (4 points)