Carly wants to buy some notebooks that cost $3.50 each. she has $20 to spend. she set up this inequality to find out how many notebooks she can buy. 3.5n < 20 which set of numbers represents all possible numbers of notebooks carly could buy? a. {0, 1, 2, 3, 4} b. {0, 1, 2, 3, 4, 5} c. {0, 1, 2, 3, 4, 5, 6} d. {0, 1, 2, 3, 4, 5, 6, 7}