Somebody help me please

Fred has a total of 62 dvd and cd. if the number of cd is three more than two times the number of dvd, how many cd does he have?

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

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10