8. How much would it cost to make 10 boxes?
A. 89
B. 75
C. 69
D.55
9. Which of the following formulas correctly identifies the cost of making the boxes.
[tex]a. \: 6n \\ b. \: 6n + 15 \\ c. \: 6n - 15 \\ d. \: 6n + 9 \: [/tex]
