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boltach
 Post subject: Can you solve this answer in 2 min?
PostPosted: Sun Nov 06, 2011 11:08 am 
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Joined: Thu Sep 08, 2011 5:42 pm
Posts: 2
I imported a coffee problem that I could not solve in two minutes...can anyone do it?


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VP_Help
 Post subject: Re: Can you solve this answer in 2 min?
PostPosted: Wed Nov 09, 2011 7:06 pm 
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Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
F = 120(2^(-at)) + 60

120 = 120(2^(-a10)) + 60

2= 2(2^(-a10)) + 1

1 = 2(2^(-a10))

1/2 = 2^(-a10)

2^(-1) = 2^(-a10)

-1 = -10a

a = 1/10


F = 120(2^(-(1/10)(30)) + 60

F = 120(2^(-3)) + 60

F = 120(1/8) + 60

F = 75

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