book Maths Puzzle Numerical Ability

1/4x - x = -15

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Hi. Here is my problem:

A cubic box with no top is to be made of plywood. How many square feet of plywood are needed if the box is to hold 64 cubic feet?

Thanks for any help you can give. plese show me how to execute each of the indicated multiplications, thankx
(x-2)(x^2+2x+4)
(5x^2+7x+3)(8x+2)
4x-6)(2x+1)