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Need help how to know if I need brackets or not for quadratic inequalities (X+4) (2x-3) Is the earth flat or round? Jw wondering what people are thinking nowadays.? Find the derivative of the function? What is the frequency of the ac voltage coming out of a wall outlet ? Distance in kilometers. Light travels in one year at the rate of 186,000m/s. To the nearest star if from earth its 4.3 light years away?