Molly earns a rebate each month on her movie tickets and books. she earns $0.25 for each movie ticket and $2 for each book. last month molly purchased 4 movie tickets and earned $17. part a: create an equation that will determine the number of books she purchased. (3 points) part b: solve this equation justifying each step with an algebraic property of equality. (6 points) part c: how many books did molly purchase last month? (1 point)