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21 March, 19:33

Efrain must spend less than $80 on his phone bill this month. He pays a monthly fee of $16, plus an additional $4 for each long-distance call.

4x + 16 < 80

How may long-distance calls can Efrain make this month?

A. x<16

B. x<48

C. x<4

D. x<64

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Answers (1)
  1. 21 March, 20:06
    0
    4x + 16 < 80 ... subtract 16 from both sides

    4x < 80 - 16

    4x < 64 ... divide both sides by 4

    x < 64/4

    x < 16 <===
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