determine the length of side y, to the nearest tenth, in each of the following triangles. Please show work

What are “like terms”? why can we only add like terms?

Which of the following represents the length of a diagonal of this trapezoid?

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