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n is increased by 8

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by sanju09 » Thu Sep 15, 2011 4:16 am
A number n is increased by 8. If the cube root of that result equals –0.5, what is the value of n?
(A) –15.625
(B) –8.794
(C) –8.125
(D) –7.875
(E) 421.875


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by cans » Thu Sep 15, 2011 4:17 am
n+8 = (-0.5)^3 = -.125
n = -8.125
IMO C
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by sl750 » Thu Sep 15, 2011 9:54 am
(n+8)^1/3 = -0.5

Cube both sides, n+8= -.125 ; n=-8.125
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