Pieter wrote and solved an equation that models the number of hours it takes to dig a well to a level of 72 feet below sea level

Question

Pieter wrote and solved an equation that models the number of hours it takes to dig a well to a level of 72 feet below sea level

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Sapo 6 months 2021-07-17T07:31:42+00:00 1 Answers 3 views 0

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  1. Nho
    0
    2021-07-17T07:33:00+00:00
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    Answer:

    It must be a positive number since it represents a number of hours.

    Step-by-step explanation:

    Given Pieter’s equation :

    7h – 5(3h – 8) = –72

    Opening up the bracket

    7h – 15h + 40 = – 72

    7h – 15h = – 72 – 40

    -8h = – 112

    Divide both sides by -8

    -8h / -8 = – 112 / – 8

    h = 14

    Since, h represents the number of hours, and the value of h equals 14 (h cannot be negative), hence, option 2 is correct.

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