C. p. 1 if z = f(a(s, t), b(s, t)) = in a cos with a(s, t) = 28 +t and b(s, t) = 8 - 2t, find the first derivatives of z with respect to the independent variables s and t. c. p. 2 if w = f(s, t) with 8 = 8(x, y,z, p) and t = (x, y, z, p), write chain rule expressions for all possible first derivatives of w with respect to the four independent variables.

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2