Comments:

23 submitted, low of 30, 10 perfect scores, avg of 88.7

Perhaps the best effort I have yet seen from this class.

40 for 29, 30 each for the other two

3-29 Keep in mind that expressing the thing as a sum of squares is not
sufficient. You must show additionally that it is zero ONLY at the origin.

3-30 Some people did a baby case and said WLOG for the general case. You need to
show the general case.

3-32 was great.