# A balloon rises straight up from the corner of 69th and Normal, at 10 ft/sec. What is the rate of...

**charles_rossrc13**

A balloon rises straight up from the corner of 69th and Normal, at 10 ft/sec. What is the rate of change of the angle of elevation between the balloon and an observer 100 feet away from the corner when the balloon is 100 feet high?

- 9 years ago
- 999999.99

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