A tree casts a shadow 21m long. The angle of elevation of the sun is 55 degrees. What is the height of the tree?

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

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Which equation is y = -6x2 + 3x + 2 rewritten in vertex form?