Evaluate each expression if x = −2, y = −3, and z = 5. 2x + 3y + z x − y 2 3x2 − 2x + 1 3y(x + x2 − y)

6x - 8 = 16 solve the following equation. then place the correct number in the box provided.

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.