Evaluate the expression if x = 5, y = 3, and z = 2.
5x - 3

Solve the system of equations. y= 2x y= x^2 - 15

Josephine has a great garden with and area of 2x2 + x - 6 square feet

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. what distance from city a is the point where the truck and the car will meet?