How to graph 2× +3y =0 by using x- and y-intersepts?

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?

Find cot x if sin x cot x csc x = √2

Which rule describes the composition of transformations that maps △abc to △a”b”c