The area of a rectangle is 180 in^2 The length is X+4. The width is X-4. What are the side lengths.

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

Simplify the expression. -2/5(10+15m-20n)

Factor these polynomials and explain how 1. 12x - 3x^2 2. 20 - 240x^2