92.
Since it is asking for the difference, that means you have to subtract the two.
Since the highest temperature is 90°F and the lowest is -2°F, you have to subtract the two.
So, it will have to be ##90°F – (-2°F)## ##= 90°F+2°F = 92°F##
(Make sure you remember that subtracting a negative number equals a positive number).



