Determine if the two lines are parallel, perpendicular, or neither. y= 3/4x + 2 and y= -3/4x - 7

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The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

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