Question

Write and solve an equation to determine how many degrees the temperature T fell. The temperature at 5 P.M. Is 20∘F. The temperature at 10 P.M. Is −5∘F.

Answer 1

Temperature fell 25°
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5 PM => 20

10 PM => -5

Find the difference between both temperatures at 5 PM and 10 PM

T = 20 - ( -5) = 20 + 5 = 25

The reason we subtracted 10 PM from 5 PM (20 - ( -5)) and not the other way around is because 5 PM obviously comes before 10 PM.