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How do you plot the the seventh root of unity? what does it look like on a unit circle like the one in the attachment? Find the volume of the solid formed by revolving the region bounded by the graphs of y= 2x^2+4x and y=0 about the y-axis? What is a positive times a positive? Could a light sail be used to propel ground vehicles? Doesn't anyone here know this? Do open ended inductor(s) and a cap form a LC circuit?