Javier boss is correct and he should not press it 5 times
<span> coefficient of the term of degree 4 in this polynomial is 3</span>
The average rate of change over the interval [-9, -3] is

That is, it's the ratio between the change in the function value over the length of the interval. Judging by the plot, we have <em>f</em> (-9) = 6 and <em>f</em> (-3) = -3. So the average rate of change is
