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Find the quotient. 50a2 – 98b2 -5a +7b

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?

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.