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 over an interval is equal to the slope of the straight line connecting the endpoints of the interval. The slope formula is:

slope = (y₂ - y₁) / (x₂ - x₁)

where (x₁, y₁) and (x₂,y₂) are the endpoints of the interval. What are the endpoints as described in the problem? Plug the endpoint values into the slope equation to get the average rate of change.