Two fireworks are set off simultaneously but from different altitudes. The height y in feet is represented by y=-16+120t+10, where t is the time in seconds. The height of the other is represented by y=-16t^2+60t+310. After how many seconds are the fireworks the same height? And what is the height?

Question

anonymous · Answer

$$-16t^2+120t+10=-16t^2+60t+310$$ is a start

anonymous · Answer

same as 
$$120t+10=60t+310$$ solve for $t$ in three steps