Answer:
- 4 3/4 degrees Fahrenheit.
Explanation
From 3 to 7 pm is 4 hours, so
Temperature at 7 pm = 5 1/4 - 4 * 2 1/2
= 21/4 - 4 * 5/2
= 21/4 - 10
= 21/4 - 40/4
= -19/4
= - 4 3/4 degrees F
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