document.write( "Question 178650This question is from textbook Algebra for College Students
\n" ); document.write( ": Amtrak's annual passenger revenue for the years 1985-1995 is modeled approximately by the formula R=-60/x-11/+962 where R is the annual revenue in millions of dollars and x is the number of years since January 1, 1980 (Association of American Railroads, Washington, DC, Railroad Facts, Statistics of Railroads of Class 1, annual). In what years was the passenger revenue $722 million? \n" ); document.write( "
Algebra.Com's Answer #133737 by ankor@dixie-net.com(22740)\"\" \"About 
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Amtrak's annual passenger revenue for the years 1985-1995 is modeled approximately by the formula R=-60/x-11/+962 where R is the annual revenue in millions of dollars and x is the number of years since January 1, 1980
\n" ); document.write( ":
\n" ); document.write( "Assume the equation is:
\n" ); document.write( "R = -60|x-11| + 962
\n" ); document.write( ":
\n" ); document.write( "In what years was the passenger revenue $722 million?
\n" ); document.write( ";
\n" ); document.write( "Replace R with 722
\n" ); document.write( ":
\n" ); document.write( "-60|x-11| + 962 = 722
\n" ); document.write( "-60|x-11| = 722 - 962
\n" ); document.write( "-60|x-11| = -240
\n" ); document.write( ":
\n" ); document.write( "Remove the absolutes and solve two equation (we will have two solutions):
\n" ); document.write( "-60x + 660 = -240
\n" ); document.write( "-60x = -240 - 660
\n" ); document.write( "-60x = -900
\n" ); document.write( "x = \"%28-900%29%2F%28-60%29\"
\n" ); document.write( "x = +15 years or 1995
\n" ); document.write( "and
\n" ); document.write( "-60x + 660 = +240
\n" ); document.write( "-60x = 240 - 660
\n" ); document.write( "-60x = -420
\n" ); document.write( "x = \"%28-420%29%2F%28-60%29\"
\n" ); document.write( "x = +7 years or 1987 \n" ); document.write( "
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