Official Act Math Thread June 2013

Test Preparation ACT Preparation
281

<p>^ I can’t remember, but I don’t think there were two sinusoidal graphs?</p>

282

<p>Yea, from my memory I can’t recall there being two sinusoidal graphs.</p>

283

<p>Oh, well did yours start down? haha</p>

284

<p>There were two. The correct one started down first.</p>

285

<p>Oh, I remember now, the problem told you when the wheel was high and when down. From that alone, I eliminated like 2 choices.</p>

286

<p>Oh yes. It stated where it reached a minimum and a maximum height (a and b). The correct sinusoidal graph did start at the minimum (down).</p>

287

<p>So what’s the answer to #59 about some inequality involving a, b, and c?</p>

288

<p>if the graph was at its minimum at a wouldn’t it have to go up next?</p>

289

<p>The graph didn’t start at its minimum…</p>

290

<p>I meant that the graph hit the minimum value first. Hope that clears things up. It did NOT start at the minimum. So yes, it did go down.</p>

291

<p>I am having a hard time seeing this can anyone provide a sketch or picture?</p>

292

<p><a href=“http://jwilson.coe.uga.edu/emat6680/dunbar/Assignment1/sine_c1.gif[/url]”>http://jwilson.coe.uga.edu/emat6680/dunbar/Assignment1/sine_c1.gif&lt;/a&gt;&lt;/p&gt;

<p>Like this but translated up a few units</p>

293

<p>That’s not right^ It went down first</p>

294

<p>^ That is the correct graph. It’s just that the graph didn’t start at that position. It started later, and it did go down first</p>

295

<p>What? You lost me</p>

296

<p>I realize that’s the right type of graph but it went down then curved back up first</p>

297

<p>Yes, I believe the graph did go down and curve back up first. The initial starting point of the sinusoidal curve did not start before -3 as it did in the graph above. Rather it started later on (I can’t remember if it started before the origin, on it, or after though.)</p>

298

<p>Ok, then I think we’re on the same page haha. I think the choice was B? Not too sure</p>

299

<p>Just to clarify, there was only one sinusoidal graph with a as the minimum. right?</p>

300

<p>It was a sinusoidal graph, and although I don’t remember what letter it was, it is the one that started at 0, went down to its minimum then up to its maximum.</p>