Dear Wenhao,

Your score in Exam 2 is  70 out of 100

Everything was right except

#1: You did not explain how you got the value, if it is Maple, you should
have said the exact Maple  line
:-2 points


#2: You did not explain how you got the value, if it is Maple, you should
have said the exact Maple  line
:-2 points

#4: completely wrong way
:-10 points

#5: completely wrong way
:-10 points

#7(d): completely wrong way
:-4 points

#9: OK, EXCEPT, that you did not multiply by -1, since the direction is DOWNWARD
: -2 points





Best wishes,

  Dr. Z.