document.write( "Question 590790: Solve the variation equation\r
\n" ); document.write( "\n" ); document.write( "The cost incurred by a trucking company vary jointly with the number of trucks in service and the number of hours they are used. When 5 trucks are used for 7 hours each, the cost are $1925. Find the cost of using 12 trucks, each for 13 hours. \n" ); document.write( "
Algebra.Com's Answer #375260 by stanbon(75887)\"\" \"About 
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The cost incurred by a trucking company vary jointly with the number of trucks in service and the number of hours they are used.
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\n" ); document.write( "cost = k*t*h
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\n" ); document.write( "Solve for \"k\" using \"when 5 trucks are used for 7 hours each, the cost are $1925\".
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\n" ); document.write( "1925 = k*5*7
\n" ); document.write( "k = 55
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\n" ); document.write( "Equation:
\n" ); document.write( "cost = 55*t*h
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\n" ); document.write( "\n" ); document.write( "Find the cost of using 12 trucks, each for 13 hours.
\n" ); document.write( "Cost = 55*12*13 = $8580.00
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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