Two trains, train a and train b, weigh a total of 231 tons. train a is heavier than train b. the difference of their weights is 165 tons. what is the weight of each train?

Train A is 198 tons and Train B is 33 tons.

Step-by-step explanation:

Take a system of equations where A+B=231 and A-B=165. If you line these up, you can use the process of elimination so you get 2A=396. Then, you divide both sides by 2. This gives you A=198. Then, subtract 165 from 198 and you get 33. Add 33 to 198 to get the original 231 tons given from the question.

step-by-step explanation:

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80