The rectangle below has an area of x 2 + 1 1 x + 2 8 x 2 +11x+28x, start superscript, 2, end superscript, plus, 11, x, plus, 28 square meters and a length of x + 7 x+7x, plus, 7 meters.

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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 !