What is the length of the hypotenuse of a right triangle with legs that are 7 feet and 10 feet respectively?

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

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

(a.s."similarity in right triangles"solve for xa.) 10b.) 20c.) 14.5d.) [tex] 6\sqrt{3} [/tex]