Information provided by the grader:

HW1:
I will give each number 2 points so that the total will be 20.

HW2:
I will grade as following: 
1- 3 pt
2- 3 pt
3 -2 pt
4 -2 pt
5 -3pt
6 -2pt
7 -2pt
8 -3pt

HW3:
all numbers except number 14 (from section 3.2) will worth 3 points.
So the total is 20 points with number 14 is 2 points. 

HW4:
The homework is graded with the following: 
-3.1 5 and 10 worth 2 pt
-3.3 16 and 18 worth 3 pt
-3.3 20 worth 2 pt
-3.4 6 and 12 worth 3 pt
-3.4 14 worth 2 pt

HW5:
I grade as the following: 
3.5 # 3 and 6 with 3 pts
3.5 # 12 with 2 pts
3.5 # 36 with 3 pts
4.2 # 2 with 3 pts and the rest 2 pts

HW6:
???

HW7:
for hw 7, it is probably 4 pts for the first two problems,
and the rest are 3 pts.

HW8:
2 3pt 
4 3pt
9 3pt
20 3pt
5 2pt
6 2pt
3 2pt
4 2pt

HW9:
7 4 pt
8 4 pt
2 2pt
3 2pt
8 2pt
9 2pt
12 2pt
22 2pt

HW10:
Each problems is worth 2 pt, so the total is 20 pts.

HW11:
3 pt for the first 5 problems,
and 2 pt for the last two (7.8 : 1, 11)