The temperature in the morning was -2 degrees f. by the afternoon, the temperature had risen 9 degrees f. what was the afternoon temperature?

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.