Answer:
Since it was -45°F in the morning and -25°F in the night, you'd find the absolute value of those numbers.
Absolute value(definition)-
The distance from the zero
So the absolute values would be...
-45 to 45
and
-25 to 25
Then you would subtract 25 from 45, which of course, would result with 20.
20 degrees is your answer.
Have a good day~