January 2010 Math thread

Test Preparation SAT Preparation
141

<p>It was a positive slope. The best fit line was in the first quadrant of the graph (which indicates a positive gradient).</p>

<p>GUYS LOOK AT THIS QUESTION THAT CAME IN THE TEST: <a href=“http://i45.■■■■■■■.com/ftewbc.png[/url]”>http://i45.■■■■■■■.com/ftewbc.png&lt;/a&gt;&lt;/p&gt;

<p>Another way to figure out the skiclub and drama club thing was to use logic and eliminate answers:</p>

<p>15 were in skiclub
12 were in drama club.</p>

<p>If 8 were in both. Then 12-8 alone did skiing and 12-8 did drama. That’s 7+4=11. And 11 ski or drama only.</p>

142

<p>Okay for area of the equilateral, here it goes:
You are given two sides of a triangle, 15 and 12. Now I kept getting stuck trying to use the pythagorean theorem, when I realized I was using it the wrong way! 15 squared is c squared, and not b squared. So it is the sqrt of 15 squared - 12 squared, which is 9. So the area of a triangle is b x h /2, which is 9x 15 /2= 67.5 Multiply this by 2 as there are two triangles in the quadrilateral, and voila, 135. </p>

<p>For the club members question:</p>

<p>There are 27 members. If 11 STUDENTS are only in one club, then that means there are 16 members left. However, these 16 members are people that are in both clubs, meaning, you divide 16 by 2, to get the amount of STUDENTS that are in two clubs. Main point is there is a distinction between students and members (student can =2 members). </p>

<p>Now, can someone please explain to me why the smallest perimeter with the 2 sides n question, is 42, and not 41?</p>

143

<p>kk. Thanks guys.</p>

<p>What do you think the curve will be like?</p>

<p>Hmm… I’m predicting something like</p>

<p>-0 800
-1 790
-2 760
-3 740
-4 720
-5 700</p>

144

<p>Oops, i meant quadrilateral not equilateral lol.</p>

145

<p>Can someone explain the aisle problem to me?</p>

146

<p>Can someone explain the four routes through F question?, I got that you could take the bottom and there were two other ways, but I remembered that the top route didn’t work.</p>

147

<p>So far, I’m at -0.
Yay!</p>

148

<p>Hey guys, I this was question 5 in the first section. I think I got it wrong. Was the triangles with greatest area these?</p>

<p><a href=“http://i49.■■■■■■■.com/1262y6t.png[/url]”>http://i49.■■■■■■■.com/1262y6t.png&lt;/a&gt;&lt;/p&gt;

<p>Ignore their proportions. I assumed that the heights which were radii would be greatest?</p>

149

<p>■■■. Of all the questions I missed that one. f m l. WOW
Any chance of still making an 800 if I were to miss one MC?</p>

150

<p>Aisle question. One row, has 20 students. So the chick is either 2 or 19. You add 20 to each of these numbers. 22, 42, 62, 82 or 39, 59, 79, 99. Therefore, she can’t sit in seat number 69.</p>

151

<p>pyxis: what i did was draw two aisles, then i wrote the number “1” next to the left aisle and the number “20” next to the right aisle. Keep doing the same, for example, the next set would be 21 and 40. Eventually you will get 61 to 80… since 69 is not near the aisle, then it was the correct answer.</p>

152

<p>Guys, for those with WRITING or MATH experimental section, which passages did u guys have?</p>

<p>Im trying to figure out which section was CR experimental.</p>

153

<p>I’d guess -1 is 760.</p>

<p>I felt like this was easier than the November test, in which -1 was also, absurdly, 760.</p>

154

<p>I put the one with the criss-cross diameters
for the triangle area one</p>

155

<p>EXPLANATION OF THE AISLE AUDITORIUM NUMBER problem:</p>

<p><a href=“http://i50.■■■■■■■.com/1zo9740.png[/url]”>http://i50.■■■■■■■.com/1zo9740.png&lt;/a&gt;&lt;/p&gt;

<p>The blue signifies the girl possible seats. Just eliminate whatever isn’t a number (69).</p>

156

<p>Can someone explain the 42 triangle perimeter question, and the XS line question with the answer 8? I guessed 10 :frowning: . I erased 8 off the paper too lol.</p>

157

<p>doughboy090891 The correct answer to that one was the circle that had the hypotenuses as the radii. Because in a triangle hyp > legs</p>

158

<p>If I wrote 30/4 for a question instead of 15/2 do i still get credit they are equal after all</p>

159

<p>jason, the one with the scientists playing 20 questions for experimental.</p>

<p>Good thing too, that was tough.</p>

160

<p>I was not sure about a question in the test, yet no one has mentioned it yet. I am not sure if it in the experimental section or not.</p>

<p>It was the last question of one of the sections. It was about a right triangle with 2 equal sides of length 4, and an overlapping one with sides 4 and 6. It was asking the length of the overlayed line.</p>

<p>Anyone remembers?</p>