Atrain decreasea its altitude by 8 m while travelibg along 200 m of track find the angle of depression

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

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?

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?