I need help with this guys

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9

How do you do the foil method with polynomials?

Barrett is comparing the membership fees for two museums.the art museum charges a one-time fee of $8.25 plus $2.25 per month. the science museum charges a one-time fee of $10.75 plus $3.50 per month. how much does barrett save by joining the art museum instead of the science museum?