1. Determine dy of the parametric equations a (t) = tz - 4t and y (t) = 2+3 - 6t. 2. Determine the second-order derivative of the parametric equations ac (t) = t2 - 3 and y (t) = 2t - 1. 3. Determine dy da2 of the parametric equations a. a (t) = t2 - 4t and y (t) = 2+3 - 6t. b. a (t) = t Int and y (t) = (t - 1)2