2/3 x -6 =9

22 1/2
10
-22 1/2
25

Average acceleration: i have no idea how to do this.

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14