Question

The graph shows the quadratic function f(x) .

Answer 1

(f(8)-f(4))/(8-4)

(4-12)/4

-8/4

-2

 the average rate of change is -2.
Hope this helps.

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Answer 2

The average rate of change is the change in y divided by the change in x...

(f(8)-f(4))/(8-4)

(4-12)/4

-8/4

-2

So the average rate of change is -2.