Answer:
I think 13 is C
Step-by-step explanation:
71+52= 123
180-123= 57
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I'm not for sure if this is what you meant though sorry
For this case we have the following function:

By definition, the average rate of change is given by:

We evaluate the function for the given values:
For x = 7:

For x = 14:

Then, replacing values we have:
Answer:
the average rate of change from x = 7 to x = 14 is:
a. 23.22
What are the options for this question?