Question

.

Answer 1

The average rate of change is another name for the slope of a line through the two points they are asking on each interval.

Average rate of change from x=a to x=b
\[\large ave~rate~change=\frac{ f(b) -f(a)}{ b-a }\]

Answer 2

that sound familiar at all?

Answer 3

Here is a picture of an exponential like the one in the prob. The average rate of change between those two points, a to b, is the slope of a line connecting them, rise over run, change in y over change in x...