What is 2 and 1/2 x 2 and 1/2?

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?

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

Peter measures the angles in a triangle. he finds that the angles are 95, 10 and 75. is he correct? explain your answer