January 2010 Math thread

<p>Why was the “line with PQRS” one 8? Shouldn’t it have been 6?</p>

<p>the one about a<em>square</em>b , the answer was 5<em>square</em>3
5^3=125</p>

<p>the triangle one is 41. 20 + 20 + 1 =41 duh</p>

<p>@ elsenorchris: Please read previous posts before posting. The identical sides were only identified as “n”. 11 = n. Thus, 11+11+20 = 42.</p>

<p>Too bad one side is 20 and the other two sides must BOTH BE N.</p>

<p>“the one about a<em>square</em>b , the answer was 5<em>square</em>3
5^3=125”</p>

<p>Yeah, 5<em>square</em>3.</p>

<p>Wait so is the answer to the one about the ski/debate club 8 or 11?</p>

<p>what was the answer for the question that said the value for x had to be 3 positive integers under 10 and the value of y had to be 3 positive integers under 20, couldnt both have had 1 2 3 making it 6/6 = 1???</p>

<p>8 kids were involved in BOTH; 11 were involved in ONLY ONE.</p>

<p>what was the answer for the question that said the value for x had to be 3 positive integers under 10 and the value of y had to be 3 positive integers under 20, couldnt both have had 1 2 3 making it 6/6 = 1???</p>

<p>It was looking for the lowest possible number, so (1+2+3)/(17+18+19) = 6/54</p>

<p>fledgling - okay. the question asked for ‘both,’ right? so the answer was 8?</p>

<p>^ Yes… 10char</p>

<p>Yup, 6/54, which simplifies to 1/9. </p>

<p>I think it’s still correct if you don’t simplify though.</p>

<p>I didn’t see anyone discussing the bonus one with that extremely weird graphs.</p>

<p>Salary: 65k
Bonus: percent*salary per year</p>

<p>I got 5/100 * 65000 Please tell it’s right :(</p>

<p>And the graph question with y coordinate being less than 1. The xvalue that gave y=1 was 3. So your answer had to be between 2 and 3 iirc. I put 2.5 Am I right?</p>

<p>6x+3>a
6x>a-3
x>(a-3)/6
x>(a/6)-.5
so you can try the answer choices. A. (a/6)>(a/6)-.5
Here you can see that 0>-.5
Or you can plug in numbers for a and see that it always works. I hope.
Anyway, (a/6)-3 is not greater than (a/6)-.5</p>

<p>

that’s how I did it. I think it came out to be 3250 or something.</p>

<p>@sunshower212 I put A for that one, I think a/6. The other answers had a/6 minus some integer.</p>

<p>@doughboy The commissions one? I forget the numbers, but it was just finding the percentage on the chart and multiplying by the salary.</p>

<p>Also, I really don’t remember the 9y/4 question. I know it’s something with yards but can someone remind me what the numbers in the question were? And how you solved?
And I’m pretty sure I got 135 for the quadrilateral because I remember getting that number for something, but again I don’t remember the question. Can someone remind me what it was?
Thanks!</p>

<p>Yup, 6/54, which simplifies to 1/9. </p>

<p>I think it’s still correct if you don’t simplify though. </p>

<p>^So, it’s still right??</p>

<p>sunshower212: the 9y/4 q went something like this…
8 feet of lumber cost $6; in terms of y, how much would y yards of lumber cost</p>