martina bought some book. she spent a total of $45 after a discount of $6 off of her purchase. each book cost $3 . how many books did she buy ?

A) write an equation that could be used to answer the questions above. First, choose the appropriate form. Then, fill in the blanks with the numbers 45, 6, and 3. Let b represent the number of books.

B) Solve the equation in part (a) to find the number of books.