document.write( "Question 1041740: The value of a machine, V, at the end of t years is given by V=C(1-r)^t , where C is the original cost of the machine and r is the rate of depreciation. A machine that originally cost $17,800 is now valued at $9,547. How old is the machine if r=0.17? \n" ); document.write( "
Algebra.Com's Answer #656689 by josgarithmetic(39630)\"\" \"About 
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\"V=C%281-r%29%5Et\"\r
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\n" ); document.write( "\n" ); document.write( "\"log%28%28V%29%29=log%28%28C%29%29%2Blog%28%28%281-r%29%5Et%29%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"log%28%28V%29%29=log%28%28C%29%29%2Bt%2Alog%28%281-r%29%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"t%2Alog%28%281-r%29%29=log%28%28V%29%29-log%28%28C%29%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"t=%28log%28%28V%29%29-log%28%28C%29%29%29%2Flog%28%281-r%29%29\"\r
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\n" ); document.write( "\n" ); document.write( "Substitute the given values.
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