The temperature T in a metal ball is inversely proportional to the distance from the center of the ball, which we take to be the origin. The temperature at the point (1, 2, 2) is 100°. (a) Find the rate of change of T at (1, 2, 2) in the direction toward the point (3, 3, 4). 320 3√5 X (b) Show that at any point in the ball the direction of greatest increase in temperature is given by a vector that points towards the origin.

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