Which algebraic expression is a polynomial?

The length of the line segment joining the midpoints of sides ab and bc of the parallelogram abcd is 10. find the length of diagnol ac

Find measure angle 1 and measure angle 3 in the kite the diagram is not drawn on the scale

The amount cami raised during last year’s charity walk, $45.50, is 7/10 of the amount she raised this year. which equation represents n, the number of dollars she raised this year?