At a concert, Natalie's brother is standing to her right and her older sister is 12 meters ahead of her If Natalie's brother and sister are 20 meters apart, how far apart is Natalie from her brother?

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

How do you use the elimination method for this question? explain, because i really want to understand!

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.