Answer:
a to b: 8
b to c: -4
c to d: -27.59
Step-by-step explanation:
Average rate of change just means slope!
I used y2-y1/x2-x1
Answer:
if u divide it then slop it u will get your answer
The speed is the ratio between the distance and the time:

Data:
d=6343miles
t=9h

Then, the plane traveled at a speed of 704.77 miles per hour.
So I would say 4/18 but it could probably be 18/81 to
822 hours. 10.25x822 is $8,425.50.