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Blue atoms? Compare the environmental consequences related to obtaining the three major types of fossil fuels? Please HELP!!!!!! Two-digit natural numbers are formed, with replacement, from the digits 0 through 9. How many numbers are greater than 57? Need help with an Algebra problem! How do you solve 12x^2 -5x=2 by using the quadratic formula? A set of values has a mean of 250 and a standard deviation of 50. What value has a z-score of -2.4?