document.write( "Question 631034: If u could please help me with find vertex of a baseball is thrown straight upward with an initial speed of 64 ft/sec the number of feet s(t) above the ground after (t) seconds is given by s(t)=-16tsquare+64t what is the maximum height? I got 320 feet but am not sure if that is correct thank you \n" ); document.write( "
Algebra.Com's Answer #397294 by ewatrrr(24785)\"\" \"About 
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\n" ); document.write( "Hi,
\n" ); document.write( "s(t) = -16t^2 + 64t Completing the Square to determinine Vertex of this parabola Opening downward
\n" ); document.write( "If y = ax^2 + bx + c ⇒ y = a(x -(-b/2a)^2) - a(-b/2a)^2 + c
\n" ); document.write( " = -16(t-2)^2 + 64 V(2,64) Max height of 64ft reached at 2sec
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