Answer: The answer is
Step-by-step explanation: Let the Pairs of given points be
(i) A(-1,12) and B(6,26),
(ii) C(-1,-9) and D(3,3),
(iii) E(12,6) and F(11,13).
Now, the rate of change for pair (i) is given by
Rate of change for pair (ii) is given by
Rate of change for pair (iii) is given by
Therefore, the average rate of change for all the sets is
Thus, the answer is