56.8×7.1= pls help

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Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

The diagonals of a quadrilaretral intersect at (-1,4). one of the sides of the quadrilateral is bounded by (2,7) and (-3,5) determine the coordinates of the other side in order for the quadrilaretral to be a square.

Which of the following is the shape of a cross section of the figure shown below