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Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours

Which of the following is missing in the explicit formula for the compound interest geometric sequence below?