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=}(y2-y1)/(x2-x1)=(8-2)/(7-1)=(6)/(6)=(1in)/(h) \end{gathered}`