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About K9-47G
- Birthday 03/23/1988
Profile Information
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Location
Atlanta, Georgia
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College Major/Degree
Physics.
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Favorite Area of Science
Genetics/Evolution.
Retained
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K9-47G's Achievements

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The vegetative state and awareness
K9-47G replied to Skye's topic in Anatomy, Physiology and Neuroscience
That's interesting. -
No, it's not a novel. He talks a lot about findings from the Human Genome Project. I suppose as far as books are concerned it's comparable to much of Dawkin's works. Informational, but with a more laid-back approach.
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Has anyone here read it? What did you think of it?
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This is one optimization problem that I just cant figure out. I'll post what I have... A hiker at point A on a straight road wants to reach, in the shortest time, a point B located 6 miles from the road and 10 miles from point A. The hiker's speed on the paved road is 4 mph and only 2 mph off the road. How far should he continue on the road before heading in a straight line for the point B? I am pretty sure I would have to use the pythagorean theorem because if you draw the problem you get a triange with two sides given. Plus I denoted [math] dr/dt [/math] to be the speed on the road which is 4 mph, and [math] do/dt [/math] to be the speed off road which is 2 mph. I just don't know how to find my objective function. Any help would be appreciated.
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I noticed that if I type .9999999999 (ten nines) into my TI-83 calculator and press enter, it gives me the answer to be .9999999999 (ten nines), But if I type .99999999999 (eleven nines) into my calculator and press enter it gives the answer to be one. I suppose my TI-83 rounds to the 10th decimal place.
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For number 3, I thought I would use the logarithmic power rule (not sure of the real name) and therefore the exponent, sinx, can be written as the first term in problem. Then I used the product rule to find the derivative.. [math] y= (\ln x)^{\sin x} [/math] is the same as [math] \sin x\ln x [/math]
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Ok, thanks a lot.
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Can you tell if those answers are right?
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1) Find [math] \frac{d}{dx} log(lnx) [/math] I assume that the log has a base of 10, so I got [math] \frac{1}{x(lnxln10)} [/math] 2) Find the slope of the line tangent to the graph [math] cos(xy)=y [/math] at [math] (0,1) [/math] [math] -sin(xy)(y)+(xy')=y' [/math] [math] -ysin(xy)=y'-(xy') [/math] [math] \frac{-ysin(xy)}{1-x}=y' [/math] Then I just keep getting 0 when I substitute (0,1) in... 3) If [math] y=(lnx)^{sinx} x>1, [/math] Find [math] y' [/math] [math] sinxlnx=sinx\frac{1}{x}+(cosx)(lnx) [/math] [math] \frac{sinx}{x} +cosxlnx [/math] [math] 1+cosxlnx [/math]
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I think the second one has to do with the purple squares in the background.
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This problem reminds me of the many examples that Richard Dawkins gave in his book, The Selfish Gene.
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11131221133112132113212221 whew.
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Can you please check if my answer is correct. [math] y=sin(sin(sinx)) [/math] [math] y'=cos(sin(sinx))cos(sinx)cosx [/math] (My calculus professor doesn't want our answers simplified.)
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ok, thanks.