Question

7. This graph represents how much Sarah charges to babysit one child. Cost Idollarg) 1 17 Time hours What is the rate of change of the cost with respect to the time?

Answer 1

To calculate the rate of change, you have to use the following formula

`k=(y)/(x)`

Choose a point

(1, 8), (2, 16) or (5, 32)

And calculate k

`\begin{gathered} k=(16)/(2) \\ k=8 \end{gathered}`

The rate of change of the cost with respect the time is k=8 $/hour