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Depth problem

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Depth problem

by yasik19 » Wed Jan 21, 2009 9:31 pm
The concentration of a certain chemical in a full water tank depends on the depth of the water. At a depth that is x feet below the top of the tank, the concentration is 3+4/&#8730;5-x (5-x under the root sign) parts per millions, where 0 < x < 4. To the nearest 0.1 foot, at what depth is the concentration equal to 6 parts per million?

(A) 2.4 ft
(B) 2.5 ft
(C) 2.8 ft
(D) 3.0 ft
(E) 3.2 ft

Answer is E

Thanks
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Re: Depth problem

by aroon7 » Wed Jan 21, 2009 10:30 pm
yasik19 wrote:The concentration of a certain chemical in a full water tank depends on the depth of the water. At a depth that is x feet below the top of the tank, the concentration is 3+4/&#8730;5-x (5-x under the root sign) parts per millions, where 0 < x < 4. To the nearest 0.1 foot, at what depth is the concentration equal to 6 parts per million?

(A) 2.4 ft
(B) 2.5 ft
(C) 2.8 ft
(D) 3.0 ft
(E) 3.2 ft

Answer is E

Thanks
3 + (4/&#8730;(5-x)) = 6
solving we get x = 3.2
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by yasik19 » Thu Jan 22, 2009 8:45 pm
wow, so easy, i wonder where i went wrong. thanks
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