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26 Oct 2007, 07:10
Kudos
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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Question Stats:
100% (02:49) correct
0%
(00:00)
wrong
based on 3
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Date
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(0.8)^-5/(0.4)^-4 = ?
A. 3/32
B. 5/64
C. 1/2
D. 1
E. 2
(From GWD - 30)
Answer: B (highlight to see)
A. 3/32
B. 5/64
C. 1/2
D. 1
E. 2
(From GWD - 30)
Answer: B (highlight to see)
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26 Oct 2007, 07:18
Kudos
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(B) for me 
(0.8)^-5/(0.4)^-4
= (2*0.4)^-5 / (0.4)^-4
= 2^-5 * (4/10)^-1 * (0.4)^-4 / (0.4)^-4
= 1/(2^5) * (10/4)
= 5*2 / (2 * 2^4 * 2^2)
= 5 / (2^3 * 2^3)
= 5 / (8*8)
= 5 / 64
(0.8)^-5/(0.4)^-4
= (2*0.4)^-5 / (0.4)^-4
= 2^-5 * (4/10)^-1 * (0.4)^-4 / (0.4)^-4
= 1/(2^5) * (10/4)
= 5*2 / (2 * 2^4 * 2^2)
= 5 / (2^3 * 2^3)
= 5 / (8*8)
= 5 / 64
you guys are on the mark. It's good exponent practice (I thought!) Thank you. 
