i kn times can be tuff for u but just kn tht it is just tuff for right now it will get easier trust me i kn nd sometimes i kn tht u just want to give up but trust me it is worth it if u keep on going=)

Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?