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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?

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?

Determine which postulate or theorem can be used to prove that lmn =nmo