I’m thinking of a number. the square of this number is the same as the number times 4. what could my number be?

I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

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?

Plot the intercepts to graph the equation