What is -1 5/6 + (-1/3)

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

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

What is r i 4.5+10r=-6.5 with work pls