4. A weather balloon rising from the ground at 120 ft/min is tracked by a range finder located 350 feet from the point of liftoff. (a) Find the rate at which the angle of inclination from the range finder to the balloon is changing when the balloon is 400 feet above the ground. (b) Find the rate at which the straight-line distance to the balloon is changing when the balloon is 400 feet above the ground.

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