The equation h(t)=-16t^2+70t+40 gives the heught of a toy rocket, in feet, t seconds after it is launched from a plat form what is the height of the platform
When x=0, the rocket is at 40 feet. the point when x is 0 is when the rocket is 0 feet off of the platform, so the platform's height is 40 feet, the y-intercept.
