Quadratic vs Exponential Functions

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

Ineed with this problem 21 show steps

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