The temperature in a city at 6:00 AM was $$-4^∘$$​ C. During the day, the temperature rose steadily by a certain number of degrees. By 3:00 PM, the temperature reached +$$9^∘$$​ C. What was the total rise in temperature during that time?

Correct option is A

Given
Initial temperature at 6:00 AM = $$-4^\circ C$$​​
Final temperature at 3:00 PM = $$+9^\circ C$$​​

Formula Used
Total Rise in Temperature = Final Temperature - Initial Temperature

Solution
Substitute the given values into the formula:
Total Rise = 9 - (-4)
Total Rise = 9 + 4 = $$13^\circ C$$​​

Final Answer
So the correct answer is (a)