Determine the value of g–1(4). –5 Negative one-half 2 3

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

Plzzz answer both questions and i will give you 100 points

2,10,-50 next two numbers geometric sequence