What are the answer to the MC?

6 If vay = y, then, by implicit differentiation, + = A) 79 2 B) 2/19 2 C) D) 74 1 7 Ify = 4 cos (2x), then dra A) -4 cos 2x B) -16 cos 2x C) -8 cos 2x D) -32 cos 2x 8) A rectangle is positioned as shown in the diagram below. 10 , b ) If one corner of the rectangle is on the line segment connecting (a,o) and (o,b), a > o, and b > o, what is the maximum area of the rectangle? A) go B) ab C) 4ab D) at