At 12 noon in anchorage Alaska Janice noticed that the temperature outside was 12

f. The temperature dropped at a steady rate of 2 F per hour.

I assume that you want to know the temperature at a certain timing.

Well, you know that at 12:00 pm, the temperature was 12 F and that it decreases by a steady rate of 2 F each hour.

This means that at 1:00 pm, the temperature was 12-2 = 10 F

At 2:00 pm, the temperature was 10-2 = 8 F

At 3:00 pm, it was 8-2 = 6 F

... and so on

You can follow this sequence to the timing you are looking for.