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Mathematics 8 Online
OpenStudy (anonymous):

Monique and her dad built a hang glider together. After testing the new glider for safety, the glider was ready for the first flight. Monique jumped off a tall sand dune and traveled in a diagonal line from the top of the dune toward the ground. She flew for 137 feet and landed on level ground at at a spot 105 feet horizontally from where she took off. How tall was the sand dune?

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