Acob is on the roof the school launching a model rocket. The height of the rocket, h(t),in metres, at any time, t, in seconds, is modelled by the function: h(t)=-5t2+15t+20 What is the starting height of the rocket?

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?