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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?

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse

The formula for the volume of a right square pyramid is given below, where a is the side length of the base and h is the height.