Answer:
The teacher gained 6 pounds per year.
[tex]\text{Rate }=\text{ 6 lbs/year}[/tex]Explanation:
Given that a teacher weighed 120 lbs. in 2008 and weighs 192 lbs. In 2020.
The rate of change of the teacher's weight would be;
[tex]\text{rate = }\frac{\text{ Change in weight}}{\text{change in time}}[/tex]Calculating the rate;
[tex]\begin{gathered} \text{Rate }=\frac{192-120}{2020-2008}=\frac{72}{12} \\ \text{Rate }=\text{ 6 lbs/year} \end{gathered}[/tex]Therefore, the teacher gained 6 pounds per year.
[tex]\text{Rate }=\text{ 6 lbs/year}[/tex]