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21 May, 11:05

A cab company calculates cab fares using the expression 1.50d + 3, where d is the distance traveled in miles. If a passenger has to pay a $21 fare for a ride, which number from the set {9, 12, 15, 18} is the value of d?

9

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Answers (2)
  1. 21 May, 14:17
    0
    1.50d + 3 = 21

    1.50d = 18

    d = 18/1.50

    d = 12
  2. 21 May, 15:02
    0
    Set 1.50d + 3 equal to $21

    1.50d + 3 = 21

    Now solve for d

    1.50d + 3 - 3 = 21 - 3

    1.50d = 18

    d = 12
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