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Which expression is equivalent to 3^3 + 2^2?

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?

On the first of each month sasha runs a 5k race she keeps track of her times to track her progress her time in minutes is recorded in the table