17. What is the sum of the measures of the interior angles of a dodecagon? Explain your answer.

How to do this , and can some one explain

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

Is of - 4x + 2? a. 3 b. 4 c. 6 d. 5