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(think of a cube 1 yd. x 1 yd. x 1 yd. which is also 3 ft. x 3 ft. x 3 ft.)7.8 cubic yards x 27 = 210.6 cubic feet

4 inches = 0.333 ft.

V = lwh

210.6 = (l)(18)(0.333)

length = 35.1 feet = 35 feet

Cube:

Cylinder: b h = pi h

Cone: (1/3) b h = 1/3 pi r^{2} h

Sphere: (4/3) pi r^{3}

Problem: What is the volume of a rectangular prism with a length of 5 m, a width of 6 m, and a height of 12 m?

Solution: LxWxH = 5x6x12

Answer: 360

NOTE: Bear in mind that ALL answers in a volume problem should be affixed with the "cube" sign.

Hope I helped. (⌒▽⌒)☆