A quantity zzz depends on two variables, and both of those variables depend on time:
z=x2y,x=t2,y=3tz = x^2 y, \qquad x = t^2, \qquad y = 3tz=x2y,x=t2,y=3t
What is dzdt\dfrac{dz}{dt}dtdz at t=2t = 2t=2?
Select all that apply.
192192192
240240240
646464
484848