Help last question on IXL . It’s in the middle of 10-20 and it’s asking what’s the slope!! I need to simplify the fraction(which is the answer)

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

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.