Which ones??? I need help!

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?

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3

An ant travels at a constant rate of 30cm every 2 minutes.at what speed does the ant travel per minute