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What are the soultion(s) to the quadratic equation 40- x^2=0

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%

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?