October 6 SAT math

Test Preparation SAT Preparation
321

<p>Point P in Plane M, how many circles with center P and circumferience 9pi exist in M</p>

<p>definitely NOT experimental; I only had 3 math sections.</p>

<p>I put ONE for this...is that right?</p>

322

<p>Ya the answer is 1... I put more than four (which is wrong) cause I was thinking of a plane as x y z plane. But a plane is like a sheet of paper that goes on forever, so there's only 1 circle.</p>

323

<p>opqpop, you missed one.. good for you.. i thought i was a math genius, and missed at least 3 T_T</p>

324

<p>why one circle when the plane goes on forever?</p>

325

<p>wait i got 12 for one of the student response. the abc. it was 1<em>2</em>6 no?</p>

326

<p>One circle because the center P never moves</p>

327

<p>Yes. 12 was a possible response.</p>

328

<p>What was the equation for the rectangle 27/2 one?</p>

329

<p>ablegreen, they said the circumference was 7pi, so the diameter had to be 7. If there's more than one circle in the plane, they would have different diameters.</p>

330

<p>^, yes 12 is correct</p>

331

<p>kevinscool, i think i had 9 for that one. but there were more than one possible answer.</p>

332

<p>what did they mean by depth of water in cylinder? i assumed it was how much water would it be filled with</p>

333

<p>they wanted you to find how high the water was when you poured it in the cylinder. The answer to that one was 2.</p>

334

<p>the height of the water in the cylinder. most ppl say the answer is 2 but i got something else</p>

335

<p>It's 2.....</p>

336

<p>what about 6 for the abc question?</p>

337

<p>*** 2? Uh i mustve missed a calculation or a conversion. im pretty sure i got 56 or something</p>

338

<p>the cylinder one has to be 2, otherwise i have to go and hang myself.</p>

339

<p>a/3 + b/6 = c/18 = 1</p>

<p>is 3 an acceptable answer, since a=1, b=1, c=3, so abc=3?</p>

340

<p>to the cone/cylinder question, r = 3 and h = 9. </p>

<p>The cone was filled with water, so it had 1/3 pi (3)^2 (9) volume</p>

<p>Then you put this volume in the cylinder and equate it to the volume of a cylinder to find the height of the water</p>

<p>1/3 pi (3)^2 (9) = (pi) (3)^2 (h) </p>

<p>solve for h and you get 2.</p>