document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=668387>Question 668387</A>: <I><SPAN STYLE=\"word-break: break-all;\"> At the start of the School trip to Washington DC the tour bus has 40 gallons of gasoline in the fuel tank. Each hour the bus uses 7 gallons of gasoline. The bus will stop for gas when there are 10 gallons left.\r<BR>\n" );
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document.write( "A. Make a table to show how many gallons of gas are remaining in the fuel tank after each hour.\r<BR>\n" );
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document.write( "B. Write and solve an equation to find how many hours will pass before the bus will have to stop for gasoline.\r<BR>\n" );
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document.write( "Answer we came up with for part A. <BR>\n" );
document.write( "gallons/ Hours<BR>\n" );
document.write( "40/0; 33/1; 26/2; 19/3; 12/4; 5/5<BR>\n" );
document.write( "we took the total gallons (40) and subtracted 7 gallons for each hour to get this chart.\r<BR>\n" );
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document.write( "Part B. we are not sure how to write the equation. <BR>\n" );
document.write( "This was our attempt: 40 gallons - 7/60 = 10 gallons<BR>\n" );
document.write( "7/60 represents the 7 gallons used each hour. 60 = min per hour.<BR>\n" );
document.write( "But we are not able to get a correct answer. So what are we doing wrong?<BR>\n" );
document.write( "Can you help please? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #415639 by </B><A HREF=/tutors/aboutme.mpl?userid=MathTherapy><B>MathTherapy(10552)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathTherapy><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=MathTherapy><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=415639\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> At the start of the School trip to Washington DC the tour bus has 40 gallons of gasoline in the fuel tank. Each hour the bus uses 7 gallons of gasoline. The bus will stop for gas when there are 10 gallons left.\r<BR>\n" );
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document.write( "A. Make a table to show how many gallons of gas are remaining in the fuel tank after each hour.\r<BR>\n" );
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document.write( "B. Write and solve an equation to find how many hours will pass before the bus will have to stop for gasoline.\r<BR>\n" );
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document.write( "Answer we came up with for part A. <BR>\n" );
document.write( "gallons/ Hours<BR>\n" );
document.write( "40/0; 33/1; 26/2; 19/3; 12/4; 5/5<BR>\n" );
document.write( "we took the total gallons (40) and subtracted 7 gallons for each hour to get this chart.\r<BR>\n" );
document.write( "\n" );
document.write( "Part B. we are not sure how to write the equation. <BR>\n" );
document.write( "This was our attempt: 40 gallons - 7/60 = 10 gallons<BR>\n" );
document.write( "7/60 represents the 7 gallons used each hour. 60 = min per hour.<BR>\n" );
document.write( "But we are not able to get a correct answer. So what are we doing wrong?<BR>\n" );
document.write( "Can you help please?\r<BR>\n" );
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document.write( "For every hour, 7 gallons of gas is expended. Therefore, we have a slope of - 7, or we can use two of the points, (0, 40) and (1, 33) to determine the slope\r<BR>\n" );
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document.write( "(0, 40) and (1, 33)\r<BR>\n" );
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document.write( "m, or slope = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2833+-+40%29%2F%281+-+0%29 ALIGN=MIDDLE  ALT=\"%2833+-+40%29%2F%281+-+0%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > ------ <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28-+7%29%2F1 ALIGN=MIDDLE  ALT=\"%28-+7%29%2F1\"   DISABLED_style= \"max-width:90%; height:auto;\" >, or - 7\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+-+y%5B1%5D+=+m%28x+-+x%5B1%5D%29 ALIGN=MIDDLE  ALT=\"y+-+y%5B1%5D+=+m%28x+-+x%5B1%5D%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "y – 40 = - 7(x – 0)\r<BR>\n" );
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document.write( "y – 40 = - 7x\r<BR>\n" );
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document.write( "y = - 7x + 40\r<BR>\n" );
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document.write( "P(h) = - 7h + 40 (Equation needed), with P being petrol remaining after h (hours)\r<BR>\n" );
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document.write( "10 = - 7h + 40 ------ Hours (10) that will pass before the bus has to stop<BR>\n" );
document.write( "7h = 40 – 10<BR>\n" );
document.write( "7h = 30\r<BR>\n" );
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document.write( "h, or amount of hours before bus has to stop = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=30%2F7 ALIGN=MIDDLE  ALT=\"30%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" >, or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4%262%2F7 ALIGN=MIDDLE  ALT=\"4%262%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" >, or about 4 hours, 17 minutes\r<BR>\n" );
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document.write( "It can be seen from the table created, that at the 4-hour juncture, only 12 gallons remain, meaning that it can travel a little more than 4 hours before having to stop to gas up.\r<BR>\n" );
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document.write( "Send comments and “thank-yous” to “D” at MathMadEzy@aol.com </SPAN>\n" );
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