What is the first error Vanessa made in her proof?

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

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?