Question

on a winter morning, the temperature before sunrise was -10°f. the temperature then rose by 1° each hour for 7 hours before dropping by 2° each hour for 3 hours. what was the temperature, in degrees fahrenheit, after 10 hours?

Explanation:

Step1: Calculate temperature after rising

Initial temp: $-10^\circ\text{F}$. Rises $1^\circ$ per hour for 7 hours.
Change: $1 \times 7 = 7^\circ$. New temp: $-10 + 7 = -3^\circ\text{F}$.

Step2: Calculate temperature after dropping

Drops $2^\circ$ per hour for 3 hours.
Change: $2 \times 3 = 6^\circ$. New temp: $-3 - 6 = -9^\circ\text{F}$.

Answer:

$-9$