document.write( "Question 118401: Please assist me with this question. Iam taking beginning algebra online and the book does not give a example of hoe to answer word problems. \r
\n" ); document.write( "\n" ); document.write( "If an object is given an initial velocity of v0 feet per second from a height of S0 feet, then its height S after t seconds is given by the formula . A rock is thrown into the air at 26 feet per second from a height of 13 feet. How long does it take to reach the earth? \n" ); document.write( "
Algebra.Com's Answer #86516 by stanbon(75887)\"\" \"About 
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If an object is given an initial velocity of v0 feet per second from a height of S0 feet, then its height S after t seconds is given by the formula . A rock is thrown into the air at 26 feet per second from a height of 13 feet. How long does it take to reach the earth?
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\n" ); document.write( "h(t) = -16t^2+vot+so
\n" ); document.write( "Your Problem:
\n" ); document.write( "h(t) = -16t^2+26t+13
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\n" ); document.write( "h(t) will be zero when the object reaches the ground.
\n" ); document.write( "You need to solve h(t)=0
\n" ); document.write( "-16t^2+26t+13 = 0
\n" ); document.write( "Use the quadratic formula to solve for \"t\":
\n" ); document.write( "t = [-26 +- sqrt(26^2-4*-16*13)/(-32)
\n" ); document.write( "t = [-26 +- sqrt(1508)]/-32
\n" ); document.write( "Positive answer:
\n" ); document.write( "t = [-26-38.833]/-32
\n" ); document.write( "t = [-64.8330]/(-32)
\n" ); document.write( "t = 2.026 seconds
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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