Question

Please help I want to learn how to solve this

Answer 1

When talking about the rate of change on a line, we're talking about the slope.

Now, let's use points:

`\begin{gathered} (4,-10) \\ \text{and} \\ (7,-30) \end{gathered}`

to estimate the slope of the line depicted in the graph.

(We'll get an aproximate value, since the graph is not suited for precise numerical calculations)

This way,

`m=(-30-(-10))/(7-4)\rightarrow m=(-30+10)/(3)\rightarrow m\approx-6.66`

The closest value to the slope we've calculated is:

F. -6.5°C/km

(Answer)