Help! In what form is an equation that relates two proportional quantities x and y?

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?

Plot the intercepts to graph the equation

This graph shows a portion of an odd function. use the graph to complete the table of values. x f(x) −2 −3 −4 −6