1.	(due 9/4) as many as needed from 15.3 # 13-38, including at least # 17-24, 30-34, 37, 38
2.	(9/4) 15.3 # 68(d)-(f), 69, 70(a), 70(c)
3.	(9/4) 15.1 # 6, 21-22, 24-27, 29-30, 32, 34, 63, 64
4.	(9/4) 15.3 # 41-44, 77
5.	(9/4) 15.4 # 4, 5, 12, 15 (for 12 and 15, just find L(x,y), no need to explain why the function is differentiable), 19, 25, 27, 28, 31, 32, 34
6.	(9/20) 15.5 # 4, 5, 9, 12-14, 22, 23, 26, 39, 43-44
7.	(9/20) 15.6 # 6, 8, 10, 12, 15, 16, 18, 20, 22, 27-29, 37(a)(b), 41, 42, 48, 51
8.	(9/20) 15.7 # 27, 29, 32, 39, 41
9.	(9/20) 15.8 # 3-5, 29, 30
10.	(10/4) 16.2 # 4, 5, 9, 10, 15, 26, 28
11.	(10/4) 16.1 # 2, 3, 11-14
12.	(10/4) 16.3 as many as needed of 1-28, including at least 5, 6, 10, 15, 16, 21, 24, 27, as many as needed of 37-48 including at least 37, 39, 45, 47
13.	(10/4) 16.4 # 7-12, 17, 19-23, 25, 29-30
14.	(10/18) 16.5 as many as needed of 3-14, including at least 5, 10, 12-14
15.	(10/18) 16.6 # 3-5, 7, 9, 10, 21
16.	(10/18) 16.7 # 7, 11, 16, 19, 27, 39(a)(b)
17.	(10/18) 16.8 # 11, 12, 17, 20, 21, 25, 35, 36
18.	(10/18) 16.9 # 2, 3, 4
19.	(11/8) 17.1 # 1, 2, 5, 6, 9, 29-32
20.	(11/8) 17.2 # 2-6, 13, 14, 17-20, 31, 32
21.	(11/8) 17.3 # 1, 2, 5, 6, 8, 12, 14, 18, 19, 27, 33
22.	(11/8) 17.4 # 9, 11, 12, 14, 15, 19
23.	(11/27) 17.5 # 12
24.	(11/27) 17.5 # 3, 5, 9, 13, 16, 18-20, 28, 35
25.	(11/27) 17.6 # 2, 3, 17, 21, 22, 35, 36, 45
26.	17.7 # 5, 7, 9, 13 (follow the model of example 2 of section 17.7), 15 (parameterize the cylinder as x = 3 cos(u), y = 3 sin(u), z = v for 0\leq u \leq 2\pi, 0 \leq v \leq 2), 16
27.	17.7 # 19 (use formula 8 of section 17.7), 21 (since the downward orientation is used, one must negate the expression in formula 8), 22
27.	17.7 # 23 (use the parameterization x=2 sin(\phi)cos(\theta), x=2 sin(\phi)sin(\theta), z=2 cos(\phi), dS = 4 sin(\phi) dR, 24 (same hint), 26 (done in class), 35 (M_{xy} is the surface integral of the function z)
28.	17.8 # 3, 5, 8, 14, 15
29.	17.9 # 3, 5, 6, 9, 23, 24, 25