Answer:
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From 5 miles to 16 miles in 11 miles in between.
Since you are given the area, we can solve for radius with this equation:


The radius is 11, so the diameter must be 2 times that, which is 22. With the correct units, the answer is
22 units²
18/6 = 3
So the temperature dropped 3 degrees each day.
Hope this Helps!!