document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=135285>Question 135285</A>: <I><SPAN STYLE=\"word-break: break-all;\"> testers drive 8 cars 200 miles on a test track at the same speed <BR>\n" );
document.write( "1.20gal 2.18 gal 3. 16 gal 4. 12 gal 5. 10 gal 6. 12 gal 7. 7 gal 8. 5 gal\r<BR>\n" );
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document.write( "a. find the fuel efficiency  in mile per gal per car?\r<BR>\n" );
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document.write( "c. write a formula for calculating the fuel efficiency based on fuel used for a 200 mile test\r<BR>\n" );
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document.write( "d. tell how fuel eficiency changes as amount of fuel used increases from 5 to 10 gal. from 15 to 20 gal\r<BR>\n" );
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document.write( "e. how do the answers in (d) show they are not linear </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #99109 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=99109\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> testers drive 8 cars 200 miles on a test track at the same speed <BR>\n" );
document.write( "1.20gal 2.18 gal 3. 16 gal 4. 12 gal 5. 10 gal 6. 12 gal 7. 7 gal 8. 5 gal <BR>\n" );
document.write( "a. find the fuel efficiency in mile per gal per car?<BR>\n" );
document.write( "Divide 200 miles by each gallon number to get miles per gallon.<BR>\n" );
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document.write( "c. Write a formula for calculating the fuel efficiency based on fuel used for a 200 mile test.<BR>\n" );
document.write( "fuel efficiency = 200 mile/(# of gallons)<BR>\n" );
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document.write( "d. tell how fuel efficiency changes as amount of fuel used increases from 5 to 10 gal. from 15 to 20 gal <BR>\n" );
document.write( "fuel efficiency = 200/5 = 40 mpg ; <BR>\n" );
document.write( "fuel efficiency = 200/10 = 20 mpg;<BR>\n" );
document.write( "fuel efficiency = 200/20 = 10 mpg;<BR>\n" );
document.write( "As the # of gallons used doubles the mpg goes down by 50%<BR>\n" );
document.write( "The relation is exponential as mpg is multiplied by 1/2 then 1/2 then 1/2 etc.<BR>\n" );
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document.write( "e. how do the answers in (d) show they are not linear<BR>\n" );
document.write( "Linear relations show a constant additive; \"d\" shows a constant multiplier.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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