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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?

For the feasibility region shown below find the maximum value of the function p=3x+2y

Quadrilateral abcd is translated up and to the right, and then rotated about point q. which congruency statement is correct?