SOLUTION: This review has a few steps. I understand most. But "e" I'm not to sure on. Please help. Let f(x)= x^2-4x and g(x)= sqrt x+4 Find each of the following: a) The domain o

Question 829905: This review has a few steps. I understand most. But "e" I'm not to sure on. Please help.
Let f(x)= x^2-4x and g(x)= sqrt x+4 Find each of the following:
a) The domain of f ------ I get that
b) The Domain of g ------- I get that
c) f(-2),f(0) ,f(4), g(0), g(8), g(6) ---- I understand this.
d) f(x+2), g(x+2), f(2+h) ----- I solved that
e) The average rate of change of g between x=5 and x=21 ---- Need Help
f) f o g, g o f, f(g(12)), g(f(12))---- Working on right now
g) The inverse of g
Not sure if that clarifies what I'm doing right now.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Average rate of change of a function, f, on interval [a,b] is,

In your case,

Just plug in values.
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