November 2012 SAT Math Level II Discussion

Test Preparation SAT Subject Test Preparation
161

<p>I think I got D for that @Exeter</p>

162

<p>Yeah. -1 was the slope. It had to go through (-1/2, 1/2), I think.</p>

163

<p>@Exter,
I got a>0 and two of the things were equal and one was different</p>

164

<p>One with exactly 2 real roots was (x^2-1)(x^2+1), correct?</p>

165

<p>Okay, that’s what I got :)</p>

166

<p>@Vergil,
That’s what I got</p>

167

<p>On the consolidated list for 2010 they had
2. Inverse equations: I and III (I is y = 1/x and III is y = 1/(x+1) +1)
I put I. Wasn’t III actually y = 1/((x-1) + 1)?</p>

168

<p>No it was y = 1/(x+1) +1) , I got that wrong if y = 1/(x+1) +1) is an inverse function</p>

<ol>
<li>What is the locus of the points equidistant from (1,1,3) and (1,2,3)? Y=3/2.
Was there an answer choice y=1? I think i put that, wouldn’t y=1 be correct too?</li>
</ol>

169

<p>No. y=1 is on the same y axis as (1,1,3) but it’s 1 unit away from (1,2,3)</p>

170

<h2>Heres the answers I got:</h2>

<p>Chance of in country and out of country calls is 4/9</p>

<p>I only for inverse. </p>

<p>Deviation was 8.4 </p>

<p>std deviation 0.1 (another question)</p>

<p>triangle / + in circle was 6/4 x 5/3 =2.5</p>

<p>folded 12 times = 10ft</p>

<p>y is unbounded for the 1 limit question (y approaches infinity)</p>

<p>For divisible prob it was I/II</p>

<p>skipped xyz coordinate thing</p>

171

<p>Option III was it’s own inverse:
y=1/(x-1)+1</p>

<p>y(y(x))= 1/(1/(x-1)+1-1)+1= x-1+1=x</p>

172

<p>This is from the nov 2010 thread which was the exact same test. Wish I read it lol. One question that hasnt been discussed is the water depth one. I think i got like 8 something.</p>

<p>CONSOLIDATED LIST

  1. Question asking about ax^3 … -> a>0
  2. Inverse equations: I and III (I is y = 1/x and III is y = 1/(x+1) +1)
  3. Roots in the between x=-2 and x=-1
  4. Mo/2^t
  5. Probability of call: 4/9 (?)
  6. New square = 4 times original square
  7. last problem: abs(sec(x))
  8. Standard Deviation: (Still) 0.1
  9. Period of abs(cos(x/2)) is 4pi (many also said 2pi)
    My opinion: 4pi for sure, just graph y = cos(x/2) and y = cos(x) together you’ll see
  10. Probability: 7280 (cant recall the question)
  11. Slope of a line: -1
  12. Magnitude of vector a-b (or b-a not sure) is 11
  13. something with abs(x)/x and answer is 2 (cant recall, can some one help?)
  14. 1 foot = 12 inches -> answer: 10.2 (10)
  15. Function with Exactly 2 real solutions: (x^2-1)(x^2+1)
  16. height of the cone: 24.84
  17. (3x^2-3)/(x-1) is undefined at x=1
  18. ax^2 + bx + c has maximum 2 solutions
  19. 2 parallel lines: slope k=m
  20. The question with compound funtion: 2x-2</p>
173

<p>:( 10charrrrrrrrrr</p>

174

<p>divisible problem was all three 2,3,&4…</p>

175

<p>What about the question: “what has exactly two real number solutions?”</p>

176

<p>@ eagles I got I and II only, it was something about 6 not being divisible by 4.</p>

177

<p>One with exactly 2 real roots was (x^2-1)(x^2+1), correct?
any one know how to do that.</p>

<p>For phone call problem, what i got was 2/9, but i put 4/9, since is #49(or something). i guessed that it would not be that easy just 1/3 * 2/3.</p>

178

<p>III was not an inversef</p>

179

<p>I suck at probability and so I just left the phone call one. The other one 2 numbers equal to 7 question, was the answer 6/10P2 ? <em>fingers crossed</em></p>

180

<p>@ Tongming yea I got (x^2-1)(x^2+1) too.</p>

<p>I also got 4/9</p>

<p>@ orangecream yea I put I only for inverse but apparently it’s I and III</p>