<p>^got that. How do you do the sqrt symbol? It’s an alt code right?</p>
<p>How was the line segments one 10? Was 15 a choice?</p>
<p>@RocknPiano.</p>
<p>You scared me there, man.
But wikipedia’s reassuring me: [Law</a> of sines - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Law_of_sines]Law”>Law of sines - Wikipedia)</p>
<p>Lakashwin—I Totallty agree with you.Guess you and I have been brought up the same way! lol.</p>
<p>How about f(t)=2cost and g(t)=sin(t/2); find the slope of the line that connects (0, f(0)) and (pi, g(pi))?</p>
<p>I got -1/pi.</p>
<p>I got -1/π also.</p>
<p>And I’m using a MacBook, so pressing option-v gives me sqr root and option-p, for that matter, gives me pi. Which looks like an n.</p>
<p>lol rust, well I guess I learned something today. @luca, that’s right. Yeah, the lnx one screwed me up, I just skipped it.</p>
<p>was -1/3 “D?”… was +1/3 even a choice?</p>
<p>How was the line segments one 10? Was 15 a choice?
I’m praying that a 43 will be an 800. So far i omited 1 and missed 3 ( or 4 if the last answer wasn’t 987)</p>
<p>^i got that, luca
I’m doing pretty well. Omitted one, missed one according to CC :D</p>
<p>For the last one (disk/laser one), wouldn’t the angle just be 0.005 (or however many 0s) because there is a 0.005 error when he was aiming for the MIDDLE of the disk.</p>
<p>for the 10.2 ABC triangle (30/50/100), I got 15.x.</p>
<p>For the segments question, consider this:
A—B—C—D—E
Segments made:
AB, AC, AD, AE (4)
BC, BD, BE (3, total of 7)
CD, CE (2, total of 9)
DE (1, total of 10).</p>
<p>That’s all there is too it. It’s like the classic “every person at a party shakes hands with another person” problem.</p>
<p>@the fed: Yeah, not that im reffereing to any collegeboard question or anything, but in my hypothetical scenario with the line wouldnt it be 15? Im sure that’d be an answer on my hypothetical math sat2 test…in theory of course</p>
<p>Does anyone remember about what # these questions were? Were they around 46-49?</p>
<p>1) series question
2) f(3) - f(1) question
3) angle made by lines</p>
<p>Also, was the parametric question = -1/3? I saw 1/3 earlier, but I got a negative.</p>
<p>ORIGINAL POST
</p>
<p>All your math is correct but you MISREAD the question.
We are asked to find the distance from the EDGE of the disk but it is stated that the laser operator is aiming for the CENTER of the disk. Therefore, the intended angle is 0 but the actual is 0.05 degrees. </p>
<p>Thus:
tan(0.05)=(x)/1188000
1188000tan(0.05)=1036.7 deviation from the CENTER
1036.7-50 = 987 deviation from the EDGE</p>
<p>I am fairly certain this is what the question asked for: If you think about it, if the disk was directly above earth and the operator had to aim for the edge of the disk, given only that “error was 0.05 degree” there is not enough information to answer the question because we are not told the direction in which that 0.05 degree deviation is made. You did this problem assuming that the 0.05 degree error was parallel to the radius of the disk, information which was not given. That without knowing which direction the 0.05 degree error was made, it is impossible to answer the question this way.</p>
<p>@rust, yeah it’s just like that. All you needed to do is 5<em>2. Same would be if it were 10 segments, 10</em>2=20.</p>
<p>Oh snap.
Looks like I learned something today, too. :P</p>
<p>For the question that asked</p>
<p>ln(x) = e^(-x)</p>
<p>It was asking for the value of ln(x) when it was equal to e^(-x)</p>
<p>It wasn’t asking for the value of x. Thankfully collegeboard didn’t even put the value of x as one of the answer choices.</p>
<p>ohlawd-</p>
<p>Quoting whatisthis-
Using tangent.
You have, the radius of the disk is 50 ft,
the distance from the center of disk to earth’s laser emitting point is 225*5280=1188000
now, you want the angle of the triangle,
which is arc tan(50/1188000) = .0024114385
the error was .05degrees,
so you add .05 degrees to the angle, because the angle should get bigger to miss the disk.
so you get .0524114385
now to find the distance from the center of the disk to the point the laser ends, you get tan(.0524113385)=x/1188000 =1086.72
subtract 50ft, to get from edge of disk.
you get 1036.72. ft
which. is. D.</p>
<p>any disagreements?</p>
<p>techinically, the triangle formed, is a right triangle, one leg being 50ft, the other leg being 1188000. the angle of .0024114385 is formed between the hypotenuse and the leg 1188000.
the angle increases to .0524114385, and you get a new leg, instead of 50ft, of 1086.7 ft.
subtract 50. you get 1036.7. </p>
<p>I don’t think it’s 987.</p>
<p>ohlawd, I hope you are right :)</p>
<p>it was asking for the y value, right? i graphed the two and found the intersection. was that right?</p>