to build a handicapped access ramp, the building code states that for every 1 inch of vertical rise in height, the ramp must extend out 12 inches horizontally

Volume is length times width times height so
20 times 8 times 30 which is 4,800
surface area is ph (p is perimeter of base), h is height.
so perimeter would be length+length+width+width so 20+20+8+8 which is 56. so multiply 56 times 30 which is 1680. hope this !

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Mind finishing up your question so that we can you?

Your answer is a.this is the only answer with the correct mean. (74.8)