The equation for a projectile's height versus time is h(t)=-16t^2+vt+h. a tennis ball machine serves a ball vertically into the air from a height of 2 feet, with an initial speed of 130 feet per second. which equation correctly models the ball's height as a function of time?

For this case we must use the projectile equation for this problem.
 We have then:
 h (t) = - 16t ^ 2 + Vt + h
 Where,
 V: initial speed
 h: height
 For the tennis ball we have:
 h (t) = - 16t ^ 2 + 130t + 2
 
 An equation that correctly models the ball's height as a function of time is:
 h (t) = - 16t ^ 2 + 130t + 2