How do i find the area of the susan b anthony chin with a diameter of 10mm?

With math question will mark brainliest question in the pic.

Ineed to know the answer to this algebra question.

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