If I have a 10% saline solution and a 5% saline solution, how would I use the two solutions to get to a 8% saline solution?

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.

What is the solution to the division problem below x3+x2-11x+4/x+4

Select the correct answer and solve for y