The area in square feet, inside a rectangle is given by the expression 1600 x? What is the value of the area if x = 15 feet?

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

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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?