Please answer for kind of a lot of points :D

You work for a lender that requires a 20% down payment and uses the standard depth to income ratio to determine a person‘s a little eligibility for a home loan of the following choose the person that you would rate the highest on their eligibility for a home loan

The parabola opens: y=√x-4 (principal square root) up down right left

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25