What is the median of the following data set: 10, 15, 20, 25, 30, 35, 40, 45?
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What is the value of x when solving the equation 5x^2 + 3x - 7 = 0 using the quadratic formula?
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What is the result when you multiply the mixed number 2 1/4 by the factor 3, and then subtract the square root of a real number that is a factor of 64?