HELP i will answer one of your question if you answer

Which expression is equivalent to sq-80

What is the order of magnitude for the number of liters in a large bottle of soda served at a party

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.