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Describe all the numbers that when rounded to the nearest thousand are 645,000

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

Find the zeros of each function. f(x) = 6x^2 - 7x - 20