Me identify the sequence graphed below and the average rate of change from n = 1 to n = 3. an = 8(1/2)n − 1; average rate of change is −3 an = 10(1/2)n − 1; average rate of change is 3 an = 8(1/2)n − 1; average rate of change is 3 an = 10(1/2)n − 1; average rate of change is −3