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The simple interest on $1300 for 4 years at 5 percent per annum is

Bring the fraction a/a-4 to a denominator of 16-a^2

Extra points! find the missing dimension! need asap

Someone answer this asap for the length, in feet, of a rectangular rug is represented by the expression 5x² + 2x. the width, in feet, is represented by the expression 3x². which expression represents the perimeter, in feet, of the rug? a. 8x² + 2x b. 8x² + 4x c. 16x² + 2x d. 16x² + 4x