Information provided by the grader:

HW5:
I awarded problem one 6 points (2 per calculation)
problem two 4 points
problem three 2 points
problem four 6 points
and problem five 2 points.

HW6:
Problem 1: 6 points
Problem 2: 2 points
Problem 3: 2 points
Problem 4: 6 points
Problem 5: 4 points 

HW7:
Each problem was weighted 4 points.

HW9:
Forgot to mention, each problem was 4 points.