Write an expression in expand form for (4.-3)

Because of your favorite lemonade it is $3.84 for 3 gallons. write this as an unit rate

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?

Acd that is originally priced at $15.85 red-tagged for the sale. what is the sale price of the cd