Answer:
The temperature after 5 hours is;
[tex]2.5^0F[/tex]Explanation:
Given that;
The temperature was -10 degrees Fahrenheit.
[tex]-10^0F[/tex]Then it increase at a rate of 2.5 degrees every hour for 5 hours;
[tex]\begin{gathered} \text{rate r= 2.5}^0F\text{ per hour} \\ \text{time t= 5 hours} \end{gathered}[/tex]The amount of increase is the product of rate and time.
[tex]r\times t=2.5^0F\times5=12.5^0F[/tex]Then the final temperature after 5 hours is;
[tex]\begin{gathered} -10^0F+12.5^0F \\ =2.5^0F \end{gathered}[/tex]Therefore, the temperature after 5 hours is;
[tex]2.5^0F[/tex]