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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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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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Mathematics
6 months
2021-07-17T07:31:42+00:00
2021-07-17T07:31:42+00:00 1 Answers
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Answers ( )
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.