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26 May, 11:38

A balloon rises straight up at 10ft/s an observer is 40 ft away from the spot where the balloon left the ground. Find the rate of change (in radians per second) of the balloon's angle of elevation when the balloon is 30 ft off the ground.

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  1. 26 May, 14:39
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    Step-by-step explanation:

    it is 30fyy
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