SOLUTION: Calculate the average rate of change between x = 4 and x = 8 for the function: f(x) = 12 + 4/5x I have been stuck on this problem for awhile and cannot figure out how to so

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Question 1175147: Calculate the average rate of change between x = 4 and x = 8 for the function:
f(x) = 12 + 4/5x

I have been stuck on this problem for awhile and cannot figure out how to solve it.

Answer by MathLover1(20850)   (Show Source): You can put this solution on YOUR website!

the average rate of change of over an interval [,] is the slope of the
secant line connecting the 2 points (,) and (,)
average rate of change =
given:
and for the function:
first find point (,) if
=> (,)
find point (,) if
=> (,)
average rate of change =
so, average rate of change is

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