A small university has 200 first-year students. Historically at this university, 88% of first-year students graduate in four yea
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{x | x < 0} and {x | x > 0} NO SOLUTION <em>(look at the picture)</em>
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{x | x ≤ 0} and {x | x ≥ 0} SOLUTION: the number 0
{x | x ≤ 0} or {x | x ≥ 0} SOLUTION: all real numbers
