8. (6 points) Let S- (a.be,de) and T- (1.2,3,4,5.6.7,8). Deternine whether the following are functions (Yes / No) (b) g: S T, g_ {(a, 4), (d.3).(c.3).(b, 5)} (d) :S-* T, i-{(a, 2),(b.2),(e l),(d, 5), (e, 8) } 9. (4 points) Rosen, Ch 2.3 6 (a-d), p. 152