document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1207823>Question 1207823</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An object is thrown down from the top of a building 1280 feet tall with an initial velocity of 32 feet per second. The distance s (in feet) of the object from the ground after t seconds is s = 1280- 32t- 16t^2. \r<BR>\n" );
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document.write( "(a) When will the object strike ground? \r<BR>\n" );
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document.write( "(b) What is the height of the object after 4 seconds? </SPAN>\n" );
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document.write( "(a) When it strikes the ground, its height is 0:<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1280-32t-16t%5E2=0 ALIGN=MIDDLE  ALT=\"1280-32t-16t%5E2=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=80-2t-t%5E2=0 ALIGN=MIDDLE  ALT=\"80-2t-t%5E2=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5E2%2B2t-80=0 ALIGN=MIDDLE  ALT=\"t%5E2%2B2t-80=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28t%2B10%29%28t-8%29=0 ALIGN=MIDDLE  ALT=\"%28t%2B10%29%28t-8%29=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "Reject the negative solution<br><BR>\n" );
document.write( "t = 8<br><BR>\n" );
document.write( "ANSWER: 8 seconds after it is thrown<br><BR>\n" );
document.write( "(b) Substitute t=4 in the given equation<br><BR>\n" );
document.write( "I leave that to you....<br><BR>\n" );
document.write( "ANSWER: 896 feet<br><BR>\n" );
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