When i double my number, add four, and then subtract my number and subtract 3, i get my number plus 1

If ac = 12 and ab=7 is it possible that bc =10

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

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a