Question 1147852
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I just found the equation of this parabola under this link


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It is  f(x) = 0.4*(x+8)*(x-50).



<pre>
The average rate of change  of this function from x= -8  to  x= -5  is


    r = {{{(f(-5) - f(-8))/((-5)-(-8))}}} = {{{(f(-5)-f(-8))/3}}}.


Notice that f(-8) = 0,  so the last formula simplifies to


    r = {{{f(-5)/3}}}.


You do the rest.
</pre>