math

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you are putting in a 20ftx30ft rectangular pool. your pool must be surrounded by a concrete sidewalk of uniform width and 3in thick.

write an expression in terms of x to represent the volume of concrete contained in the sidewalk. explain how you got your expression.

  • math -

    If x is the width in feet, the volume in cubic feet is

    [(30 + 2x)(20 + 2x)- 30*20]*(1/4)

    That expression can be simplified somewhat by canceling out the 600's.

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