Which function represents a horizontal shift of ƒ(x) = 5x by 4 units to the right? a. g(x) = 5x + 4 b. g(x) = 5(x - 4) c. g(x) = 5x - 4 d. g(x) = 9x

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?