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<li> if F: (x,y) --> (x+2y, y)</li>

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<p>^I got this one right... but I'm not familiar with this notation. What does the (x+2 **,y , y)** mean? </p>

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<li> if f(2x+1)=2x-1, then f(x)=</li>

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<p>b. x-1

c. x-2 (correct)</p>

<p>(working backwards) I thought that you treated (x-1) as x, like you do when: f(x) = 2x+1, g(x) = x^2, where g(f[x]) = (2x+1)^2 ? </p>

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<li><p>Imageshack</a> - snapshot201005262.jpg

its inverted, and unclear, but it asks for the area of the triangle in terms of theta. The diameter of the semicircle is 2 btw. (answer = 2sinxcosx)</p></li>

<li><p>the magnitudes of vectors a and b are 5 and 12 respectively, the magnitides of vector (b-a) could NOT be: </p></li>

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<p>A. 5</p>

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<li> I see this problem type all the time, and I always forget how to do it. 6.31^m = 3.02^n. What is the value of m/n?<br></li>

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<p>D. .8</p>

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<li> What is the length of the major axis of the ellipse whose equation is 60x^2 + 30y^2 = 150. I plugged it into my Ti 89 and it said undefined at -2, and 2, (i used the table setting) so I logically concluded that the major axis could be greater than 4. However, the answer is 4.47. How come?</li>

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