Compare: 2.5 tons and 4000 pounds * 2.5 tons > 4000 pounds
2.5 tons < 4000 pounds
2.5 tons = 4000 pounds

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?

The total number of dental clinics total for the last 12 months was recorded

Yesterday, george drank 1 small bottle and 2 large bottles, for a total of 1,372 grams. the day before , he drank 1 small bottle and 1 large bottle, for the total of 858 grams. how many grams does each bottle hold?