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

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Director
Joined: 28 Mar 2017
Posts: 962
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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Math Expert
Joined: 02 Sep 2009
Posts: 44290
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: https://gmatclub.com/forum/the-longevit ... 87977.html

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