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When a certain tree was planted it was 4 feet tall, and the [#permalink]
18 Oct 2006, 00:49
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When a certain tree was planted it was 4 feet tall, and the height of the tree increased by a constant amount each year for the next 6 years. At the end of the 6 th year, the tree was 1/5 taller than it was at end of 4th year. By how many feet did the height of tree increase each year.