Use the functions below to (a) express dw/dt as a function of t, both by using the Chain Rule and by expressing w in terms of t and differentiating directly with respect to t. Then (b) evaluate dw/dt at the given value of t. W = z - sin xy, x = 5t, y = ln (t + 4), z = e(t + 3), t = -3 Express dx/dt as a function of t. dx/dt = Evaluate dx/dt at t = -3. (dw/dt)t = -3 = _____. Give the values of b, h, and k for the function f(x) = log2 (x + 2)-9.