document.write( "Question 623263: A certain mountain has an elevation of 19,459 feet. In 1915, the glacier on this peak covered 10 acres. By 2004 this glacier melted to only 1 acre.\r
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Algebra.Com's Answer #392008 by Theo(13342)\"\" \"About 
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it melted 9 acres in 2004 - 1915 = 89 years.
\n" ); document.write( "9 / 89 = .101123596 acres per year on the average assuming the glacier melted at a constant rate each year.
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