I've been stuck on this for half an hour

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?

Micheal is 4 times as old as brandon and is also 27 years older than brandon. how old is micheal

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b