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31 August, 12:12

Brian is ordering books online. He has $100 to spend on the books. Each book costs $7. The shipping charge for the entire order is $8. The number of books, b, that Brian can buy is represented by the inequality 7b + 8 < 100. How many books can Brian buy without overspending?

13

15

18

20

+5
Answers (2)
  1. 31 August, 12:36
    0
    You have $100 but the shipping is $8 so you subtract that from $100 and get $92, At $7 dollers a book you can get 13 books before going over 7x13=91. So the answer is 13 and you will spend $99 total.
  2. 31 August, 12:40
    0
    You have to plug in the numbers.

    So first let's plug in 13. 7*13+8=99

    Now 15. 7*15+8=113

    Now 18. 7*18+8=134

    Lastly 20. 7*20+8=148

    The answer is 13.
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