document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=148535>Question 148535</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A student has scores of 75, 79, and 81 on three government exams. What score does she need on a fourth exam to give her an average of 80 or better. Let x represent the fourth test score..  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #108869 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=108869\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "Let x=score on fourth exam\r<BR>\n" );
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document.write( "So the average A of all 4 exams are\r<BR>\n" );
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document.write( "75, 79, and 81 <BR>\n" );
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document.write( "Since the average must be greater than or equal to 80, this means that the right side is greater than or equal to 80\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2875%2B79%2B81%2Bx%29%2F4%3E=80 ALIGN=MIDDLE  ALT=\"%2875%2B79%2B81%2Bx%29%2F4%3E=80\"   DISABLED_style= \"max-width:90%; height:auto;\" > Set the right side greater than 80\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=75%2B79%2B81%2Bx%3E=320 ALIGN=MIDDLE  ALT=\"75%2B79%2B81%2Bx%3E=320\"   DISABLED_style= \"max-width:90%; height:auto;\" > Multiply both sides by 4.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%2B235%3E=320 ALIGN=MIDDLE  ALT=\"x%2B235%3E=320\"   DISABLED_style= \"max-width:90%; height:auto;\" > Combine like terms on the left side.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%3E=320-235 ALIGN=MIDDLE  ALT=\"x%3E=320-235\"   DISABLED_style= \"max-width:90%; height:auto;\" > Subtract <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=235 ALIGN=MIDDLE  ALT=\"235\"   DISABLED_style= \"max-width:90%; height:auto;\" > from both sides.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%3E=85 ALIGN=MIDDLE  ALT=\"x%3E=85\"   DISABLED_style= \"max-width:90%; height:auto;\" > Combine like terms on the right side.\r<BR>\n" );
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document.write( "Answer:\r<BR>\n" );
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document.write( "So the answer is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%3E=85 ALIGN=MIDDLE  ALT=\"x%3E=85\"   DISABLED_style= \"max-width:90%; height:auto;\" > which means that the student must get an 85 or better on the 4th exam. \r<BR>\n" );
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