How do I do B?

is L'( + ) = 0 at least ) lines Rocket A has positive velocity v(t) after being launched upward from an initial height of O feet at time : = 0 seconds. The velocity of the rocket is recorded for selected values of t over the interval 0 s t $ 80 seconds, as shown In the table below. 10 (seconds) 20 30 40 50 60 70 5 (feet per second) 14 22 29 35 40 44 a. Find the average acceleration of rocket A over the time interval 0 S t $ 80 seconds. Indicate units of measure. 29 ( - 59 30 - 0 b. Using correct units, use a left Reimann sum with 3 subintervals of equal length to approximate the area under v(t) above the x-axis over the time interval 0 s t