In order for the barge operator to meet his expenses, he has to haul at least 120 tons of freight. how many railroad cars must the barge operator haul on each trip to at least break even?

()1. how do you find range? 2.the following set of data is to be organized into a histogram. if there are to be five intervals on the graph, what should the length of each interval be? 30, 34, 23, 21, 27, 25, 29, 29, 25, 23, 32, 31

Lee has $1.75 in dimes and nickels. the number of nickels is 11 more than the number of dimes. how many of each coin does he have?

Simplify the expression. -2/5(10+15m-20n)