Please help me please please

Which of the following properties can be used to show

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

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?