Identify the rate of change

14.

f (0) = 7; f (n + 1) = f (n) + 5

This is an arithmetic sequence, f (n+1) = f (n) + d, where d is the common difference. The rate of change is:

f (n+1) - f (n) = f (n) + d - f (n) = d

In your sequence, d = 5.