Write an explicit formula for the sequence 8,3,-2,-7,-12… then find a14

Alarge rectangle is divided into four smaller rectangles.

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

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.