Question 637396
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
h= -16t^2+vt+c
Question states***initial velocity of 158ft/s,launched from atop a 102-foot cliff
 -16t^2+ 158t + 102 = 0        || ax^2 + bx + c = 0
 {{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
 {{{x = (-158 +- sqrt( 158^2-4*(-16)*102 ))/(2*a) }}}
 {{{x = (-158 +- sqrt( 31492 ))/(32) }}}
    x = 10.5 sec