Question

A bungee jumper falls from a bridge 300 feet above ground. Her height above ground after t seconds is given by the equation h=-16t^2+400 where h is the height of the jumper in feet and t is the time in seconds since her jump. Approximately how long will it take for the bungee jumper to reach 100 feet above the ground on her initial jump?

Answer 1

answer for first one is b.4.3 h= -16t^2+400 100= -16t^2+400 100-400=-16t^2 -300 = 16t^2 (divide both sides by -16) 18,75 = t^2 (take square root of both sides 4.3 = t