What number is 25% of 35% of 400

Find the value of the variable and the length of each secant segment

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

If m 17 27 90 63 ** picture is attached