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At 3 p.m. the temperature outside was 5 1/5 degrees Fahrenheit. The temperature then fell steadily by 2 1/2 degree per hour for the next 4 hours. What was the temperature at 7 p.m.

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2 1/2 x 4 = 10
5 1/5 - 10 = - 4 4/5
The temperature at 7 p.m. was -4 4/5 degrees Fahrenheit.
User Mercator
by
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3 votes

Answer:


-4.8 degrees Fahrenheit

Explanation:

Let
t be temperature.


t at 3:00PM:
5.2 degrees.

Every hour, the temperature falls by
2.5 degrees per hour for the next four hours. Let's multiply 2.5 by 4 to find out the total temperature drop in four hours.


(2.5)(4)=10

In four hours, the temperature dropped 10 degrees. Since it is getting colder, let's subtract this from the original 5.5 degrees to get the temperature at 7:00PM.


5.2-10=-4.8

The temperature at 7:00PM was -4.8 degrees Fahrenheit.

User Inversion
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