A launched rocket has an altitude, in meters, given by the polynomial h+vt-4.9t^2, where h is the height, in meters, from which the launch occurs, at velocity v in meters per second, and t is the number of seconds for which the rocket is airborne. If a rocket is launched from the top of a tower 50 meters high with an initial upward speed of 30 meters per second, what will its height be after 2 seconds?

h+vt-4.9t^2
Where h = 50
v = 30
t = 2

50+30*2-4.9*2^2
whats the answer?
i got 620.4

Question

A launched rocket has an altitude, in meters, given by the polynomial h+vt-4.9t^2, where h is the height, in meters, from which the launch occurs, at velocity v in meters per second, and t is the number of seconds for which the rocket is airborne. If a rocket is launched from the top of a tower 50 meters high with an initial upward speed of 30 meters per second, what will its height be after 2 seconds?

h+vt-4.9t^2
Where h = 50
          v = 30
          t = 2

50+30*2-4.9*2^2
whats the answer?
i got 620.4