Official September 2013 ACT Math Thread

<p>sorry i confused myself in my last post.
i think it was a right triangle b/c the vertical line that includes point A was tangent to the circle (i think) so that means that it formed a right angle, which then formed a right triangle. so then you could use cos56 to figure out AO</p>

<p>I believe it was 2a+2b > a+2b+3C</p>

<p>I used equilateral triangles with measurements of 1,1,1 and 5,5,5 and it was the only equation that worked both times.</p>

<p>Also someone else worked the problem out with a triangle with different lengths rather than an equilateral earlier and came to the same conclusion.</p>

<p>Isn’t it 2a+2b>a+b+c because b was the hypotenuse. Plus, 1, 1, 1 works with this too…</p>

<p>I was pretty sure about 2a + 2b>a+b+c</p>

<p>Also, does anyone remember the second answer choice in the parabola question, and if it was correct?</p>

<p>My bad, thats the one I meant. I was thinking about the wrong answer. I apologize, its somewhat late and I didn’t proofread my post because I’m lazy</p>

<p>That was embarrassing by my part haha -.- Anyone else having trouble sleeping after taking this test?</p>

<p>TheArtistic, (-2/5, 3) was B. I hope it’s correct. I put that :stuck_out_tongue: and I already missed the cos56 question.</p>

<p>Patton370, yeah I’m having trouble sleeping and trying NOT to worry about my score :(</p>

<p>So we can all agree on cos56? That was the last question I had to do so I just guessed.</p>

<p>alright, im not even sure if I put that now that I think of it…
One more: what was the answer to the one with an A and a B value that used two different equations?</p>

<p>a = 1 and b =2.</p>

<p>Cos56 was B right?</p>

<p>I’m just assuming cos56 is right. Assume the worst, right? Cause I put sin28. Does anyone remember if a=1 and b=2 was B?</p>

<p>I’m almost positive #59 was D. Wasn’t it?</p>

<p>wait, for the 2a + 2b>a+b+c question, where was the information that b was hypotenuse? I didn’t see it in the question… Was there such information? If not, you shouldn’t assume that b was hypotenuse (although it could be).</p>

<p>OKay for the 2a+2b>a+b+c this was for sure the answer. Others have touched on the same explanation that I am about to give. So let me just reiterate why it’s the right answer. </p>

<p>If you subtract the a and b on the right side of the inequality, you are left with a+b>c.</p>

<ol>
<li><p>You are allowed to subtract from both sides in an inequality. You can essentially treat it as an equation (not quite though but in this case we can since we’re only subtracting).</p></li>
<li><p>Two sides of a triangle MUST be greater than the third length. </p></li>
</ol>

<p>Hence, 2a+2b>a+b+c. This is for sure, 100% the correct answer.</p>

<p>For the trapezoid question, was 52 the lowest number out of the five choices?</p>

<p>Cos 56
2a+ 2b> a+b+c</p>

<p>YES!</p>

<p>I got 2a+2b> a+b+c also. I am 99% sure that is the answer.</p>

<p>Yes lilwill18 the last 3 in fact were D and the 2 before that were B. Can anyone else confirm this??</p>

<p>What do you guys think the curve is? I think I got - 4 or - 5 based on responses I’ve seen on here. What do you think I got for math?</p>