16. The temperature at a point in the plane is T(x,v) = 100-3x2-2y3. A bug is at the point (1,-1). (a) Compute â½T(1,-1). (b) Find the rate of change of temperature in the direction of v (3, -4). (c) Find the direction in which the bug should move to increase its temperature the fastest. (d) Find a direction in which the bug should move to NOT change its temperature.