What can you do to check if your answer in any proportion problem is correct?

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

At 6 1/2 cents per pound of string beans how much does 7 pounds cost

5x−4≥12 or 12x+5≤−4 can you with this problem