Question

Use the image to answer the question.

A coordinate graph is shown. The horizontal axis spans from 0 to 9 in increments of 1 and the vertical axis spans from 0 to 19 in increments of 1.
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What is the average rate of change of a function on the interval x:[4,8]
?

(1 point)
Responses

12
12

11
11

4
4

3
3

Answer 1

Average rate = (f(8) − f(4)) / (8 − 4). From the graph f(4)=7 and f(8)=19, so (19−7)/4 = 12/4 = 3.

Answer: 3