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Algebra To calculate the height of a tower Mary measures the angle of elevation from a point A, to be 10. She then walks

Algebra To calculate the height of a tower Mary measures the angle of elevation from a point A, to be 10. She then walks directly towards the tower, and finds the angle of elevation from the new point B to be 20. What is the height of the tower to the nearest tenth of a meter? Show all your work.

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