avg rate of change !!

Question

Find the average rate of change in millions/day, of the daily receipts from day 42 to day 112

Days (right side) ----- $Receipts (left side)
14	33.111
28	14.666
42	5.587
56	2.95
70	1.567
84	0.852
98	0.397
112	0.279
126	0.518

Answer 1

The average rate of change is simply the rise / run between the two points mentioned. If the independent variable is days then the run between 112 and 42 is (112-42) 70 days. The rise would be .279-5.587. Divide the rise over the run and you have your average rate of change over that interval.