Which of the following sets represents the domain of the function shown? {(2, 7}, (15, 13), (21, –4), (24, 18)}vvv

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

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

Which shows the graph of the solution set of 3y – 2x > –18?