Question

7. After 1 hour it hadrained 2 inches andafter 7 hours it hadrained 8 inches. What isthe rate of change?

Answer 1

$\begin{gathered} \text{Let:} \\ (x1,y1)=(1,2) \\ (x2,y2)=(7,8) \\ \text{Rate of change=}\frac{y2-y1}{x2-x1}=\frac{8-2}{7-1}=\frac{6}{6}=\frac{1in}{h} \end{gathered}$