document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=177810>Question 177810</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am not sure how to do solve these problems. \r<BR>\n" );
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document.write( "*In a College Algebra class, the final exam is 20% of the course grade. If Greg's regular exam scores are 80, 64, 88, 92, and 85, what does he need to make on the final exam to make a B (80%) in the course?\r<BR>\n" );
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document.write( "*At fine restaurants, a 15% gratiuty is added to the check by the management. If your bill comes to $93.89, how much did the meal alone cost?\r<BR>\n" );
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document.write( "*At Bob's Fish House, small shrimp cost $4 per pound and large shrimp cost $6.50 per pound. A customer wishes to pay exactly $75 (before tax) for 15 pounds of a mixture of shrimp. How many pounds of large and small shrimp should Bob package for the customer? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #132794 by </B><A HREF=/tutors/aboutme.mpl?userid=Mathtut><B>Mathtut(3670)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Mathtut><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=132794\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> *In a College Algebra class, the final exam is 20% of the course grade. If Greg's regular exam scores are 80, 64, 88, 92, and 85, what does he need to make on the final exam to make a B (80%) in the course? <BR>\n" );
document.write( "*At fine restaurants, a 15% gratiuty is added to the check by the management. If your bill comes to $93.89, how much did the meal alone cost? <BR>\n" );
document.write( "*At Bob's Fish House, small shrimp cost $4 per pound and large shrimp cost $6.50 per pound. A customer wishes to pay exactly $75 (before tax) for 15 pounds of a mixture of shrimp. How many pounds of large and small shrimp should Bob package for the customer?<BR>\n" );
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document.write( "1)We must assume that the other test make up 80%(and are equally weighted) of the his overall score..since there is no homework or quizzes involved here<BR>\n" );
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document.write( "so lets call x what he needs to score on the final exam<BR>\n" );
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document.write( ".8((80+64+88+92+85)/5)+.2x=80<BR>\n" );
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document.write( ".8(81.8)+.2x=80<BR>\n" );
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document.write( "65.44+.2x=80<BR>\n" );
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document.write( ".2x=14.56<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28x=72.8%29 ALIGN=MIDDLE  ALT=\"highlight%28x=72.8%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >%,needs this score to get a B<BR>\n" );
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document.write( "*At fine restaurants, a 15% gratiuty is added to the check by the management. If your bill comes to $93.89, how much did the meal alone cost? <BR>\n" );
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document.write( "let x be the cost of the meal<BR>\n" );
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document.write( "x+.15x=93.89<BR>\n" );
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document.write( "1.15x=93.89<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28x=81.64%29 ALIGN=MIDDLE  ALT=\"highlight%28x=81.64%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >dollars, cost of meal<BR>\n" );
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document.write( "*At Bob's Fish House, small shrimp cost $4 per pound and large shrimp cost $6.50 per pound. A customer wishes to pay exactly $75 (before tax) for 15 pounds of a mixture of shrimp. How many pounds of large and small shrimp should Bob package for the customer?<BR>\n" );
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document.write( "let x and y be the number of pounds of small and large shrimp respectively<BR>\n" );
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document.write( "x+y=15.......eq 1<BR>\n" );
document.write( "4x+6.5y=75...eq 2<BR>\n" );
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document.write( "lets rewrite eq 1 to x=15-y and plug that value into eq 2<BR>\n" );
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document.write( "4(15-y)+6.5y=75<BR>\n" );
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document.write( "60-4y+6.5y=75<BR>\n" );
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document.write( "2.5y=15<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28y=6%29 ALIGN=MIDDLE  ALT=\"highlight%28y=6%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >pounds of large shrimp<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=15-y=15-6=highlight%289%29 ALIGN=MIDDLE  ALT=\"x=15-y=15-6=highlight%289%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >pounds of small shrimp<BR>\n" );
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