algebra
posted by Pat .
polynomial
with h+vt4.9^2
50 meters high
30 meters per sec.
what is height after 2 sec.

Plug the values in.
h = 50m
t = 2s
v = 30m/s
h+vt+4.9*t^2=? 
h+vt4.9 t^2 (typo)
from
h = Ho + Vo t + (1/2) a t^2
where a = gravity = 9.8 m/s^2
Ho, initial height = 50m
Vo = initial velocity up = 30
so
50 + 30 (2)  4.9 (4)
= 110  about 20 = about 90
you use your calculator 
typo a = 9.8m/s^2
(down)