document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=896837>Question 896837</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The amount of paper needed to cover a box top in the shape of a trapezoid is 198cm squared.if the height of the box top is 18cm and the length of one of the bases is 10cm,find the length of the other base. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #543790 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=543790\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> length of the other base is 12.\r<BR>\n" );
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document.write( "area of a trapezoid is equal to 1/2 * h * (b1 + b2)\r<BR>\n" );
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document.write( "h = 18<BR>\n" );
document.write( "b1 = 10<BR>\n" );
document.write( "b2 = 12\r<BR>\n" );
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document.write( "area = 1/2 * 18 * (22) = 9 * 22 = 198\r<BR>\n" );
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document.write( "you solve by plugging what you know in the formula and then solving for what you don't know.\r<BR>\n" );
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document.write( "you know that area is 198 and height 18 and one of the bases is 10.\r<BR>\n" );
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document.write( "formula becomes:\r<BR>\n" );
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document.write( "198 = 1/2 * 18 * (b1 + 10)\r<BR>\n" );
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document.write( "simplify to get 198 = 9 * (b1 + 10)\r<BR>\n" );
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document.write( "divide both sides by 9 to get:\r<BR>\n" );
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document.write( "198/9 = b1 + 10\r<BR>\n" );
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document.write( "subtract 10 from both sides to get:\r<BR>\n" );
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document.write( "198/9 - 10 = b1\r<BR>\n" );
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document.write( "solve for b1 to get b1 = 12.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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