Recall That the Flight of a Projectile Can Be Modeled $\theta$

Multiple Choice

Recall that the flight of a projectile can be modeled with the parametric equations:
, where t is in seconds, v_o is the initial velocity, $\theta$ is the angle with the horizontal, and x and y are in feet.
A projectile is launched at a speed of 420 ft/sec at an angle of 37° with the horizontal. After how many seconds does the projectile hit the ground? Round to one decimal place.

A) 15.8 seconds
B) 31.6 seconds
C) 7.9 seconds
D) 21.0 seconds