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If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other

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 graph represents f(x)=[x]+3. what is f(-2.2)?