# What is the new temperature in Chicago, if one morning it was -8^\circ F and over the next six hours the temperature rose 25 degrees Fahrenheit?

Since the temperature rose $\text{25"^o"F}$, that means the temperature increased by $\text{25"^o"F}$. So you should add $\text{25"^o"F}$ to the original temperature of $\text{-8"^o"F}$.
$\text{Final temperature}$ = $\text{-8"^o"F}$ + $\text{25"^o"F}$ = $\text{17"^o"F}$
$\text{Final temperature}$ = $\text{25"^o"F}$ + ($\text{-8"^o"F}$) = $\text{17"^o"F}$