document.write( "Question 289867: Hi, I hope someone can help me. My problem is:\r
\n" ); document.write( "\n" ); document.write( "Niagara Electric charges a flat fee of $8.50 for the first 1000 kilowatt hours used, $0.05 per kilowatt hour for the next 4000 kilowatt hours, and $.04 per kilowatt hour for each hour used thereafter. What is the expression for the cost function, C(x), using standard notation? \n" ); document.write( "
Algebra.Com's Answer #209872 by ankor@dixie-net.com(22740)\"\" \"About 
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Niagara Electric charges a flat fee of $8.50 for the first 1000 kilowatt hours used, $0.05 per kilowatt hour for the next 4000 kilowatt hours, and $.04 per kilowatt hour for each hour used thereafter. What is the expression for the cost function, C(x), using standard notation?
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\n" ); document.write( "I think you need two expression
\n" ); document.write( "x =< 5000 kwh
\n" ); document.write( "C(x) = .05(x-1000) + 8.50
\n" ); document.write( "and
\n" ); document.write( "x > 5000 kwh,(add 1 cent per kwh for 4000 kwh)
\n" ); document.write( "C(x) = .04(x-1000) + 40.00 + 8.50
\n" ); document.write( "C(x) = .04(x-1000) + 48.50 \n" ); document.write( "
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