November 2009 SAT Math (US only)

<p>Rawk could you elaborate why it’s 2?</p>

<p>I saw that from tbonus. Let me rephrase the basic wording:</p>

<p>There are 6 blue socks, 6 red socks, and 6 green socks. What is the least number of socks that you can choose to ensure that you receive a pair?</p>

<p>The answer word “ensure” is key. The least number possible to get a pair is technically two for obvious reasons. The answer would be 4 if the first three socks were different, but 7 is correct to ensure a pair with random selection.</p>

<p>CrossTheUniverse-- definitely 2. Hard to explain? It was really visual.</p>

<p>Could you elaborate anyways? Something about 48 surface area in a cube</p>

<p>^I guess my logic is wrong. I am confusing pair with receiving a different sock. I think that gets rid of my 800 M.</p>

<p>There must have been two versions… I didn’t have that sock question</p>

<p>CrosstheUniverse-- I am trying to remember the 48 surface area one. If the surface area of the cube was 48, then the answer for the surface area of a face was 8 (there are six faces on a cube). However, if the area (not SA) of the big cube was 48…well…then I’m sunk…I put 8 (I read a bit too quickly and was careless)</p>

<p>Does anybody remember the answer that was either 18<em>route3 or 24</em>route3?</p>

<p>4 for the socks</p>

<p>the surface area of a cube is 48
was is the surface area of one face = 8</p>

<p>Ladidada thank you. I was seriously questioning my ability to divide there, haha. 800 still possible.</p>

<p>Wasn’t the answer just 6s^2 = 48 -> s^2 = 8 = Area?</p>

<p>Hey did anyone have a question with a large triangle and three small triangles inside and you had to find perimeter?</p>

<p>Nobody seems to have an answer to the 18<em>route3 or 24</em>route3…it was really hard! I’m stressing out about it so much…please somebody, if you remember, help me out!</p>

<p>3,000,000 people not invert tv
6 people over a 7/10
solve for x + 3x + 100 triangle = 20
surface area of one side is 8
4.2x10^3 = 4,000-10,000
two numbers with a difference of 1… i forget the answer
mallon falls</p>

<p>187 I got 8 as an answer for the area of the cube’s face as well.</p>

<p>two #s with a difference of 1 was 1/2 and 3/2. The product of those two (the answer) is 3/4.</p>

<p>anyone remember the population question? population increased by 13200 something like that</p>

<p>187 was that a grid in?</p>

<p>187, The answer to that question with 2 functions f(x) and g(x) and the resulting function with zero slope was f(x)/g(x) because if you divide, x’s disappear and the graph will be a line parallel to the x-axis (which makes the slope =0). f(x)-g(x) only gives zero slope in one case, which is if f(x)=g(x) (lines coincide). If f(x)<>g(x), the slope is non zero.</p>

<p>@tbonus: yes it was a grid-in.
@YAHA: That doesn’t work. Let f(x) = 3x + 4 and g(x) = 3x+5. If you divide those two and graph it, you’ll notice it’s not a zero slope; rather, it’s quite asymptotic. f(x) - g(x) works because the slopes will always cancel each other out. f(x)/g(x) only works if the y-ints are the same, but that means it’s the exact same line, which the question said they are not.
Think of it this way:
f(x) = mx + a
g(x) = mx + b
a and b are constants; m is the same for both.
y = f(x) - g(x) = mx + a - mx - b = a - b (a constant, which is the answer).</p>

<p>So was section 5 the experimental one? Can a 25-minute section be experimental?</p>