<p>When people say the “periodic” question, which one does that refer to?</p>
<p>Periodic one was on the last page…either last problem or next to last.</p>
<p>@Potatoman – which parametric question? I don’t remember any.</p>
<p>The train one was easy. 80 mph * t to find the miles driven at 80mph; subtract from 240 to find miles left, divide by 60mph to find hours, then simplify.</p>
<p>Wait, for the question about the population of the two towns, isn’t the answer 4? I solved for t using the solve function on my TI-89 and got 6 solutions, but the first 2 were negative…and you can’t have negative time so it’s 4 intersections, right?</p>
<p>well there was a question with y = secx as an answer choice wasn’t there? o.O</p>
<p>@mathisfun111
Something like:
f(x) is period in 3 (?)
f(a-1) = -1
f(a) = 0
f(a+1) = 1</p>
<p>what is f(a+2)</p>
<p>@littlemobilefish</p>
<p>There were definitely six positive solutions.</p>
<p>@PotatoMan
I don’t think you know what parametric means then…</p>
<p>@littlemobilefish
Yeah there were many more than 2 negative ones, but 6 positive</p>
<p>@OtherWindow
And yes i do know what parametric is… i remember a question asking to eliminate the parameters and solve for y. But maybe I’m just imagining things</p>
<p>Oh jeez I’m ■■■■■■■■. I didn’t realize what the question meant by a “period of 3” until just now. Ffffffff…</p>
<p>Same here Ronaldo LOL. I saw it and had like 1 minute left and just spazzed.</p>
<p>I was also stupid on it. I saw “periodic” and instantly started thinking of trig functions. Thus, I wanted a similar pattern…
with -1, 0, 1</p>
<p>I thought … “hey, it must start going down after it hits the highest point! 0! Duh!”</p>
<p>…
Fail.</p>
<p>PotatoMan, I also got y = sec x for one of them!</p>
<p>For the population one, were the equations -1200cos((T)pi/6)+1500 and 1200(1.025)^T? (still have them on my calc)</p>
<p>There was one question that gave you a right triangle with sides 1, x, and y and asked you do calculate the angle (I think). Is that the one you’re talking about?</p>
<p>@zach12
I remember that one, I too, got sec x.</p>
<p>You got like cos x = 1/y using right triangle trig rules then took the reciprocal.</p>
<p>^^ Those equations sound right</p>
<p>I got sec y as well. Or sec x, whichever.</p>
<p>BTW, here’s a graph that shows the 6 times those two graphs cross:</p>
<p>[y=</a>; -1200cos(pix/6) + 1500 and y=1200(1.025)^x from 0 to 50 - Wolfram|Alpha](<a href=“y= -1200cos(pi*x/6) + 1500 and y=1200*(1.025)^x from 0 to 50]y= - Wolfram|Alpha”>y= -1200cos(pi*x/6) + 1500 and y=1200*(1.025)^x from 0 to 50 - Wolfram|Alpha)</p>
<p>
I had these equations as well.
It wouldn’t graph properly for me, so I just gave up. . .</p>
<p>Do we get our scores earlier than the people who took the SAT I since less to grade?</p>
<p>@littlemobilefish
For some reason my private messages aren’t sending through
yeah i believe those equations were correct. If you divide both equations by 1200 and find the intersection starting at 0, you’ll see 6 intersections between 0 and 31</p>
<p>mathisfun111:
The collegeboard site says the SAT people get them on the 26th, but it didn’t specifically include subject tests. Nor did it exclude them though.</p>