Find the length of the arc. Leave answer in terms of pi

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

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