January 2009 SAT Math Discussion

<p>it should be 2 then^</p>

<p>I didn’t take it, but judging from other people’s post, I think its 2.</p>

<p>@nicolab</p>

<p>No</p>

<p>Well poo, I think I put x=2 but I’m not sure. </p>

<p>I missed only one the last time I took it, would suck if I got a lower score now. (the stupid book one took ALL my time, didn’t grid-in the circle one, which was so easy. I contemplated going back to that section, but ended up not doing so).</p>

<p>i read something about a pentagon that was experimental? i certainly did not have that, so i must not have the experimental math right?
i had 2 math sections in a row, however…</p>

<p>anyone think this month’s will have a higher math curve?</p>

<p>Nicolab: No, it wasn’t.</p>

<p>i know squad. i took the january sat and don’t remember any surface area question</p>

<p>Yeah, all of a sudden I’m starting to forget all the answers I put and doubt myself. I think I put 2 for the cube volume one but for some reason I think I might have put 3…Hopefully I’m just going crazy. :D</p>

<p>what score do you think 1 wrong will be?</p>

<p>does anyone remember the info given for the graph with (-a,b) and (a,0)?</p>

<p>the answer is definitely 2 for the volume…if it was 8 volume would be way too big</p>

<p>i think b was 4. It was some cubic graph, with a zero at x=a. </p>

<p>does anyone know how to do the question that involved finding the slope of the tangent line?</p>

<p>@ingette the answer was either 4 or 67-3sqrt2 as the correct answer (they are both correct for different graphs), I’m mixing up two graphs here.</p>

<p>@phlpsun yeah the volume one was 2</p>

<p>does anyone know what the answer was to to m and 3m isoceles triangle one, and the 5, a, b, 5… one?</p>

<p>

</p>

<p>Forgot about this one, but I remember putting 4 I think.</p>

<p>Also, did anyone else get 6sqrt2 for an answer? I think it involved a parabola.</p>

<p>EDIT: Yeah I meant 2sqrt6 sorry</p>

<p>Ingette: The equation of the graph is y = 2 - (x^3).</p>

<p>Answer to question was 4.</p>

<p>Zoax: Yes, I got 6sqrt2 for the parabola one.</p>

<p>it was 2sqrt6 zoaxanthellae</p>

<p>

</p>

<p>I think the point was (-3,4) so since it was a tangent it touched the circle [and thus touched a radius of the circle] and, as a tangent, was perpendicular to that radius, its slope would be the negative reciprocal of the radius’ slope. The radius slope comes about to be -3/4 so negative reciprocal…4/3.</p>

<p>My explanation is iffy but I’m pretty sure the math works out.</p>

<p>Was this one experimental?</p>

<p>5 a, b, 5</p>

<p>For the 5, a, b, 5 question:</p>

<p>The question states a < 0</p>

<p>a could be -1. If this is true, b = -5</p>

<p>So…</p>

<p>5, -1, -5, 5, -5^2, -5^3, 5^5, -5^8, -5^13, 5^21</p>

<p>Ok thanks, got that one wrong then.</p>

<p>For the k - 1/k question, I’m pretty sure the tenths digit was 8.</p>