3 x 4(hours) = 12
60 - 12 = 48
At 4am the temperature was 48 degrees
If you list the answer choices, I might be able to help you better.
There are a few other ways to answer this but one way i know is 5x + 15
angle 5 = angle 1 = Corresponding Angles Postulate
angle 6 + angle 5 = 180 = linear pair postulate
