Help me please

The temperature at a point (x, y, z) is given by T(x, y, z) = 200e-x2 - 3y2 - 922 where T is measured in C and x, y, z in meters. (a) Find the rate of change of temperature at the point P(2, -1, 5) in the direction towards the point (5, -3, 6). .c/m (b) In which direction does the temperature increase fastest at P? (c) Find the maximum rate of increase at P