2011 January SAT: Math

<p>it was w^2 to x^2
so it turned out to be like 81:36, which is 9:4</p>

<p>but werent the equations x=2y and y=1/3w
that would then go to x=2/3w
then squaring them would be x=4/9w which would then be 9x=4w</p>

<p>What was the exact question? Does anyone remember…
oh here</p>

<p>x=2y, so x is 6, y is 3.
y=1/3w, so y is 3, w is 9.</p>

<p>It was 9:4, I’m almost 100% sure. </p>

<p>Does anyone remember the answer to the Function Question with the Parabola and the Line? Where they met at (0,0) and (3,3), and you had to find like g (a) - f (a) < 0 or something like that, and what value of A worked for that? </p>

<p>I’m disappointed in the wording of the radio question, I put 3/5 at first but thought it was too easy and assumed they wanted us to multiply, so I ended up with 2/5. :/</p>

<p>"Does anyone remember the answer to the Function Question with the Parabola and the Line? Where they met at (0,0) and (3,3), and you had to find like g (a) - f (a) < 0 or something like that, and what value of A worked for that? "</p>

<p>Answer is two. The question basically meant, at what x coordinate was the line’s y-coordinate higher than the parabola’s y-coordinate.</p>

<p>Great, that’s what I got. Thanks :)</p>

<p>By the way, if anyone wanted an explanation on the 50/51, one, here’s what I did. I first added the first two, three, four, etc. and realized a pattern.</p>

<p>It was 1/2, 1/6, 1/12, 1/20, etc.</p>

<p>1st: 1/2 is just 1/2
2nd: 1/2 + 1/6 is 4/6
3rd: 4/6 + 1/12 is 9/12
4th: 9/12 + 1/20 is 48/60, or 16/20</p>

<p>Now if you take a look at the end result, if you let n = the number in the sequence it’s in, you just get: </p>

<h2>(denominator) - n </h2>

<p>denominator </p>

<p>For example, 1/2 is just 2 - 1 / 2. 4/6 is 6 - 2, etc. (Sorry if this is a bit confusing, haha.)</p>

<p>In the end, you just get (50)(51) - 50 / (50)(51)</p>

<p>That’s just 2500 / 2550, which when simplified is 50/51. Hopes this makes a BIT of sense…</p>

<p>just to make sure for the grid-in about c^d = 64 what is d^c…81 or 1 works right? just making sure because there were multiple possibilities.</p>

<p>thanks</p>

<p>For the graph one with 5200, 5700 choices, I literally drew a line from the X axis with my eraser as a ruler and it ended up VERY close to the 5500. But I adjusted the line a bit and it was barely over the 500 mark, so it had to be 5700.</p>

<p>@ csk90 thats right</p>

<p>@parakeetfeet
It what value of “a” is g(a) - f(a) negative?
The “a” is the X values and the functions g(a) and f(a) are the Y values.
You look for Y value of graph g(a) that is smaller than the Y value of f(a).</p>

<p>This occurred in the X coordinate 2 I believe.</p>

<p>

</p>

<p>Yeah, i hated this problem. my logic was that 5700 is closer to 5500 (200 difference) than 5200 is (300 difference).</p>

<p>Does anyone remember what answer choice 9:4 was for the w^2:x^2 problem? I remember specifically re-checking that one problem multiple times for what they were asking for but forgot what I ended up putting. I feel like I put either (D) or (E) and not (A), (B), or (C).</p>

<p>I could have SWORN the graph problem’s answer was either 4200 or 4700. The one in the last math section, right?</p>

<p>It was 5200/5700</p>

<p>You mean 5200 and 5700?
The general consensus is 5700</p>

<p>That was choice D I think.</p>

<p>What were the two open ended questions where the answers were both 4?</p>

<p>That’s the only thing I’m worried about before getting the 800.</p>

<p>One was the remainder one (If x is divided by 10, it’s remainder is 6, if y is divided by 10, it’s remainder is 8, what’s the remainder when x + y is divided by 10) and the system of equations one IIRC.</p>

<p>“and the system of equations one IIRC.”</p>

<p>The x y z one?</p>

<p>If so… I’m set for an 800!</p>

<p>@Tenors</p>

<p>If you’re referring to the problem I think you are, the answer was 16.</p>

<p>x + y = z
z = 8
What does x + y + z equal?</p>

<p>^^That was the x y z question I remember.</p>