I am doing some Calc review for my final and i would appreciate a step by step explanation for this problem instead of just an answer. Thanks!

Question

anonymous · Answer

I will post the table of values, just a sec

anonymous · Answer

|dw:1368152752249:dw|

anonymous · Answer

First: the problem says to find the average rate of change of f(x) between x=1 and x=3, and i got 0.55 as an asnwer.
Second, the problem says:
Use average rates of change to approximate the instanteneous rate of change of f(x) at x=2
thanks for any help