Find the x-value of all points where the function has relative extrema. Find the value(s) of any relative extrema.f(x) = x4/3 - x2/3

A. Relative maximum of 0 at 0; Relative maximum of -   at - 
B. Relative minimum of of -   at 
C. No relative extrema.
D. Relative maximum of 0 at 0; Relative minimum of -  at  and - 


Answer: D

Mathematics

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The number of persons aged 18-64 receiving disability benefits through Social Security, the Supplemental Security income, or both, from 1990 through 2000 is approximated by the function     where  is measured in units of a million and t is measured in years,

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?
Compute . Round the answers to the nearest thousandth.
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__________ million
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Mathematics