<p>Yes, since they gave you #'s on the line you could calculate the range</p>
<p>Therefore - 1 & 3</p>
<p>1 & 3=D or E?
i remember wt letter i put but i don't remember wt i put
i think i either put D or E</p>
<p>The "x^2+2x+4=(x+2)^2+a(x+2)+b" question was -2.</p>
<p>x^2 + 2x + 4 = (x^2 + 4x + 4) + (ax+2a) + b. </p>
<p>Since we only have one term that is in the form of "Zx" where Z is a real rational number, it must be that 4x+"Zx" ( in this case, ax), 4x+ax=2x. So, -2. I think this is right.</p>
<p>Also, (-1.5,2) doesn't work.</p>
<p>Y>2*(-3/2)^2 -1. y>9/2 -1, y>7/2</p>
<p>7/2 = 2.5. so 2>2.5 no.</p>
<p>for the question that a lot of ppl are saying the answer was I & III, do you remember what # that was? in the 40-50? I'm trying to figure out whether I skipped that or not</p>
<p>^ OMFG I had a brain fart.</p>
<p>I put in a neg sign for -5.5 < 2 GODD ugh1!!!</p>
<p>I think it was right before the 40s...</p>
<p>for the a question? Can you just discount b like that? I understand your expansion but where did b go if you want to equate them to each other?</p>
<p>-2 is right. </p>
<p>Did anyone get (1, -sqrt(3)) as an answer for something about an equilateral triangle?
How about pi/4 for something about the probability of points a distance of 1 from the origin?</p>
<p>(btw, is this legal or not?)</p>
<p>@hipster: yea, I got both (1, -sqrt(3)) and (pi/4).</p>
<p>Yes, I got (1, -sqrt(3)) as the answer for the equilateral triangle. The points were (0,0) and (2,0) because 3x = 6 (perimeter given)</p>
<p>Then you plug both points into distance formula. While d=2 for some pt to pt, 1 sqrt3 was the only answer which satisfied both pts of a distance of 2</p>
<p>edit:</p>
<p>another probability question (chance that both are blue marbles, given red)</p>
<p>was 5/24 right?</p>
<p>And polar problem was some 306.6 thing?</p>
<p>can someone tell me whether the 1 & 3 std deviation/ range problem is D or E?</p>
<p>I also got (-1,sqrt 3) for triangle.</p>
<p>What about the circles tangent to each other. It asked for ''r'' of one of the circles. I got 1.73</p>
<p>I did get (1,-sqrt(3)). I skipped the other one.</p>
<p>lolilaughed:</p>
<p>in any two equivalent polynomials ax^2 + bx + c = dx^2 + ex + f,</p>
<p>a=d, e=b, f=c. always. So i used that same concept, you can just disregard b since we're only dealing with the "x"s. I can explain further but I have some work to do right now so I'll be back a little later.</p>
<p>Edit: ^^ rjacob, I think i got that.</p>
<p>I just did 3-sqrt(11). and then 2+(3-sqrt(11)). Whatever that answer is. It was around 1.7.</p>
<p>Wasnt the stndard deviation question</p>
<p>I. Set A has at least half points higher than Set B
II. Set A has a higher Standard Deviation than Set B
III. Set A has a smaller range than Set B</p>
<p>I got III only</p>
<p>^ I posted the I, II, III breakdown</p>
<p>The answer, I got, was I & III (my answer). I think the answer was E it was like:</p>
<p>I just remember seeing that since III must be true, the only options must be I and III or I only..</p>
<p>A. I only
B. II only
C. III only
D. II and III
E. I and III</p>
<p>^ i think</p>
<p>Yeah, the "r" one with circle I got 5-sqrt(11) = 1.73</p>
<p>Yeah but the graphs were like:</p>
<p>xxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxx---[||||||]--
-----[|||]--------xxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxx</p>
<p>wait, that's 1.68, isn't it??</p>
<p>Which one was the circle one? It was like x^2 + y^2 = 11 ? Then what was the question lol</p>
<p>Yeah it is. The answer was 1.7 (A, if i remember correctly..not too sure though). I don't remember putting 1.73 but idk. I'm pretty sure my method was correct</p>
<p>The question was
(x-3)^2 + y^2 =11. (x+2)^2 + y^2 = r^2. Find r.</p>
<p>Question: x^2-25/x^2-5x</p>
<p>what values of x are undefined. I got 0 and 5</p>