A)Determine the average rate of change over the interval x€ [1,5] of the function y= 3x + 1. B) regardless of the interval what will the average rate of change or instantaneous rate of change be for the function y=3x+1? Expand your answer to include linear functions in general

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?