Eddie stacks boxes in his garage. Each box is 1 3/4 feet tall. The distance from the garage's floor to its...

5. Eddie stacks boxes in his garage. Each box is 1 3/4 feet tall. The distance from the garage's floor to its ceiling is 8 1/2 feet.
6. a. What is the greatest number of boxes Eddie can stack in his garage?
7. Explain how you decided how to round your answer in part (a).