Simplify the exponent in 4^-3 × 4 ^5

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

Using the information in the customer order, determine the length and width of the garden. enter the dimensions. length: feet width: feet

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25