Plz hlep me pl. plz plz plz pl explain and show you work plz plz plz

The graph below shows the height of a projectile t seconds after it is launched. if acceleration due to gravity is -16 ft/s2, which equation models the height of the projectile correctly?

Meg constructed triangle poq and then used a compass and straightedge to accurately construct line segment os, as shown in the figure below, which could be the measures of angles pos and angle poq?

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)