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.

The correct answer is: b