When a certain tree was first 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 6th year, the tree was 1/5 taller than it was at the end of the 4th year. By how many feet did the height of the tree increase each year?
(1)3/10 (2)2/5 (3)1/2 (4)2/3 (5)6/5
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发表于 2013-5-9 08:14:58
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