Marlon built a ramp to put in front of the curb near his driveway so he could get to the sidewalk more easily from the street on his bike. A rectangular prism with a length of 6 inches, width of 18 inches, and height of 6 inches. A triangular prism. The triangular sides have a base of 8 inches and height of 6 inches. The prism has a height of 18 inches. If the ramp includes the flat piece as well as the angled piece and is made entirely out of concrete, what is the total amount of concrete in the ramp? 768 inches cubed 936 inches cubed 984 inches cubed 1,080 inches cubed