A. -2 6/7, -3/2, 2.25, 2 1/3
B. 10:00 AM and 4:00 PM
C. The biggest change was 2.25 to -2 6/7, or 4:00 AM to 10:00 AM
D. I'm not sure what part C is referring to so I can't help with that one.
E. I believe it will decrease since it tends to decrease as the day goes on and then increase once again. (that seems to be the pattern, at least)