<p>If anyone hasn’t seen [schoolifun’s</a> math level 2 study guide](<a href=“https://docs.google.com/file/d/0BzncGbb0X1ioMmQ2NDY4NGMtNTI3YS00YWIzLWIyNTktOTUyZmMzZWZjNzU1/edit?authkey=CNXr0vgD&pli=1&hl=en#]schoolifun’s”>https://docs.google.com/file/d/0BzncGbb0X1ioMmQ2NDY4NGMtNTI3YS00YWIzLWIyNTktOTUyZmMzZWZjNzU1/edit?authkey=CNXr0vgD&pli=1&hl=en#), it looks really helpful</p>
<p>I suck at probability too (probs since I haven’t done it like 3 years) but Khan academy is very helpful. I like it much more than Barrons.</p>
<p>I took the test on December and I cancelled my score because I did not think I tried my best on it. Hopefully I won’t have to cancel this one.</p>
<p>I just took another Chung and got another 640. My scores have been 640, 640, 640, 730, 710 (untimed). I’m going to go and sob into my pillow now.</p>
<p>Hey Team Rocket, can you post a page or two of the Dr Chung’s test on imgur and post it? i want to see the difficulty of it</p>
<p>how screwed am I if I’m doing barron’s and have 640 and 620 and tests 2 & 3 QQ</p>
<p>depends on what your goal is. I’ve seen on CC that you need to be able to get above 700 barrons in order to get above 780 for real</p>
<p>Trying to gauge with Barron’s isn’t accurate. I got 700+ in the last couple of Barron’s ones I took, and I only got a 750 on the actual.</p>
<p>I’ll try to post Chung when I have time.</p>
<p>Just scored a 740 in Dr. Chung! (Still not confident though.)</p>
<p>TeamRocketGrunt, PLEASE!!! If you send it to people through pm, please pm me! Thanks!!</p>
<p>PM me as well. Does anyone know of a good site that explains geometric sequence and ellipses/hyperboles?</p>
<p>I can try and explain them here, if you want.</p>
<p>A ** geometric sequence ** is a sequence that builds from starting with initial value: a
and multiplying it by the common ratio, r</p>
<p>Thus, the first value is a
the second is ar
the third is ar^2
the 4th is ar^3 </p>
<p>Thus, we can write it as: a(r)^(n-1). N-1 is so because a is the first value. </p>
<p>The common ratio can be calculated by doing a * r^(n+1)/a * r^(n)</p>
<p>we sum the terms of a geometric series by doing</p>
<p>a(1- r^n-1) / (1-r)</p>
<p>Now, if r< 1, it will converge on a value. There are proofs and crap for it but I haven’t see them for years, so I’ll ignore that.</p>
<p>To calculate the sum if r < 1, we take the limit of a(1 - r^n+1)/ (1-r) if n -> infinity</p>
<p>this means a(1- very small value)/1-r which can be written as a(1)/1-r or a/1-r. </p>
<p>** Ellipses ** are when you have a function</p>
<p>(x-h)^2/a^2 + (y-k)^2/b^2 = 1</p>
<p>They are described as sum of the distances to two fixed points (the foci) is constant. </p>
<p>You can create these functions by effectively solving for a circle; however, both x and y won’t be balanced, so you’ll divide by the final value.</p>
<p>The major axis (if a>b) will be 2a; the minor will be 2b. The foci is sq root a^2 - b^2 and are (h+/c, k). </p>
<p>You can flip the reasing if b> a</p>
<p>This is a bit on hyperbolas: [url=<a href=“Hyperbola”>Hyperbola]Hyperbola[/url</a>]</p>
<p>Thanks :D. Good luck, guys</p>
<p>Well, for <em>infinite</em> geometric series, they will converge iff |r| < 1. And you’ve pretty much proved your statement about convergent series.</p>
<p>TeamRocket PM me too (is that messaging? I’m new to CC). I’m so nervous, I’ve been scoring 720 on the last 2 collegeboard tests and i need a miracle for it to become my dream score of 800. I truly don’t understand how people think this test is “easy”.</p>
<p>@indianchickadee well, everyone has their strengths and weaknesses. I personally found Math II to be quite easy. However I would probably fail at a history or literature subject test.</p>
<p>Guys, I’m extremely sorry, but my scanner’s stopped working, so I have no way of getting the exams to any of you. I’ll try to find a way tomorrow or Friday, but it seems unlikely. Again, really, really sorry.</p>
<p>@MITer94, yeah, I guess so. It’d still be nice not to feel useless after getting 720 when others are easily getting 800. I always thought myself good in math, but…I guess not.</p>
<p>Also, does anybody know where I can find Princeton Review Practice SAT 2 for math online for free? I don’t want sparknotes bc Ive heard of the mistakes on there, and I have Barron’s. I’ve taken the 2 CB tests too…</p>
<p>Well…doesn’t mean you can’t improve.</p>