document.write( "Question 296000: suppose it costs $8 to dig a hole 1 foot deep, $6.40 for the second foot, $5.12 for the third foot, and so forth. How much would it cost to dig a 5-foot deep hole? \n" ); document.write( "
Algebra.Com's Answer #213352 by richwmiller(17219)\"\" \"About 
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8+6.40+5.12+ 4.096+3.2678=26.8928
\n" ); document.write( "c(h)=(.8)^4*8+(.8)^3*8+(.8)^2*8+(.8)^1*8+(.8)^0*8\r
\n" ); document.write( "\n" ); document.write( "c(h)=8*(.8^4+.8^3+.8^3+.8^2+.*1+.8^0)
\n" ); document.write( "8*3.3616=26.8928=$26.90 round up
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