Two values that have a sum of 13.

Which recursive formula can be used to determine the total amount of money earned in any year based on the amount earned in the previous year? f(n+1)=f(n)+5

What is the quotient of m^6/5 ÷ 5/m^2? assume m does not equal pl

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