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Domenic and Adriana are observing...

Domenic and Adriana are observing a hot air balloon from two tracking stations on the ground. The tracking stations are 6 km apart (each on different sides of the balloon). From Domenic's point of view the hot air balloon is at an angle of elevation of 72 degrees. From Adriana's point of view, the angle of elevation is 58 degrees. Determine the height of the balloon.

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