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# The longevity of a certain metal construction is determined by the fol

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The longevity of a certain metal construction is determined by the fol  [#permalink]

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09 Mar 2018, 02:34
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Question Stats:

100% (00:12) correct 0% (00:00) wrong based on 9 sessions

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The longevity of a certain metal construction is determined by the following formula: l = $$(7.5 – x)^4$$ + $$8.97^c$$, where l is the longevity of the construction, in years, x is the density of the underlying material, in g/cm3, and c is a positive constant equal to 1.05 for this type of metal constructions. For what value of density, x, expressed in g/cm3, will the metal construction have minimal longevity?

A. -7.5
B. 0
C. 7.5
D. 15
E. 75

OA After 24 Hours

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Re: The longevity of a certain metal construction is determined by the fol  [#permalink]

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09 Mar 2018, 03:06
gmatexam439 wrote:
The longevity of a certain metal construction is determined by the following formula: l = $$(7.5 – x)^4$$ + $$8.97^c$$, where l is the longevity of the construction, in years, x is the density of the underlying material, in g/cm3, and c is a positive constant equal to 1.05 for this type of metal constructions. For what value of density, x, expressed in g/cm3, will the metal construction have minimal longevity?

A. -7.5
B. 0
C. 7.5
D. 15
E. 75

OA After 24 Hours

Discussed here: the-longevity-of-a-certain-metal-construction-is-determined-by-the-fol-187977.html

P.S. The OA MUST be provided from the beginning.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: The longevity of a certain metal construction is determined by the fol &nbs [#permalink] 09 Mar 2018, 03:06
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