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When a certain tree was planted it was 4 feet tall, and the

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Joined: 05 Mar 2006
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When a certain tree was planted it was 4 feet tall, and the [#permalink]

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18 Oct 2006, 01:49
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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.

1.) 3/10
2.)2/5
3.)1/2
4.)2/3
5.)6/5

Any explanations will be appreciated.
Thanks.
VP
Joined: 25 Jun 2006
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18 Oct 2006, 02:17
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4 + 6x = (4 + 4x)*(1 + 1/5).
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