A model created by an engineer is represented by the following multivariable functions w = ye 0 =s't, y =tu, 2 = su-. Ow Ow Ow (a) Find Or dy dy Oz (b) Find s' ds' as leaving your answers as expressions in terms of s, t, and u. Or dy Oz (c) Find at ' at ' at leaving your answers as expressions in terms of s, t, and u. Or dy Oz (d) Find leaving your answers as expressions in terms of s, t, and u. du ' du du (e) Find the values of when s = 2, t = 1, u = -2. at