do you understand how functions are defined? do you realize that h(t) gives the height at any time t? do you realize, for example, if i wanted to find the height after 2 seconds, this would simply be h(2)?

there is a formula for this, it should not have been too hard to find in your text.b. What is the average velocity of the rocket over the first 40 seconds of flight (between t= 0 and t = 40)?

the average velocity between t = 0 and t = 40 is given by

hint: the derivative gives us the formula for the instantaneous velocityc. What is the (instantaneous) velocity of the rocket at lift-off (t = 0)? What is the velocity after 40 seconds?