2. [1.2] Use limits to determine the slope of the tangent to the curve f (x) =3x2 at x = -3. [5] 3. [1.3] A stone is dropped from a cliff. The height (in meters) of a stone above the ground can be modelled by h(t) = -5t2 + 20, where t is the time in seconds. What is the rate at which the stone is falling 2 seconds after the drop