Question

The graph shows the value of a car at different years after Joanna purchased it.Which answer is the best estimate for the average rate of change between year 9 and year 14?

Answer 1

The average rate of change can be found through the formula

`average=(f(b)-f(a))/(b-a)`

then, looking at the graph, the points that are needed are (14,750) and (9,1400).

Using the formula,

`\begin{gathered} average=(1400-750)/(9-14) \\ average=(650)/(-5) \\ average=-\text{\$}\frac{130}{\text{year}} \end{gathered}`