Question

5. The temperature is 8 degrees. It is expected to fall 5 degrees each hour for the next

several hours. In how many hours will the temperature be-7
degrees?

Answer 1

-7°

Explanation:

after 1 hr temp = 3°

after 2 hrs = -2°

after 3 hrs = -7°

Answer 2

3 hours

Explanation:

We can set up an equation and solve. Let x be hours that have passed, the answer to our question.

-7 = 8 -5x - Created equation

-15 = -5x - Subtract -8 from both sides

3 = x - Divide both sides of the equation by -5

In 3 hours the temperature will be -7°.