PLS ONLY REAL ANSWERS 100 points

What number should be added to both sides of the equation to complete this square? x^2-10x=7

What is the distance between the points 4,10 and -3,-14 on the coordinate plane

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