<p>It’s interesting. There seems to be a lot of disagreement on answers for this ACT.
I thought I did okay. Missed the dice problem, though. -_____-</p>
<p>for the infiniti one i wasnt sure but i put one because it was n-1/n x n/n+1.
(2/3 x 3/4)= 1/2 (3/4 x 4/5)= .6 and it kept increasing so i put 1. If someone’s gonna say im wrong please prove it so i know my mistake</p>
<p>I think I put B for the slope question. I think A was a trap answer for people who were buzzing through the test.</p>
<p>I put a plus sign for the approaching problem and it screwed me over. damn calc mistype. anyway, a+5, b+4 is right, because it is a linear association, and the problem specifically state that it was a line.</p>
<p>The slope problem is just rise over run.</p>
<p>The equation is y=4/5x</p>
<p>SO, y increases 4 when x increases 5… since points on a graph are written in the form (x,y), in order to represent a point on the line, the answer would be (x+5, y+4)</p>
<p>do u guys remember the answers for the distance and midpoint problems. Distance was 19 and midpoint was 2 right?</p>
<p>For the fractions problem. The correct answer was 0 and here is why:</p>
<p>This was the question:
(2/3)<em>(3/4) … ([n-1]/n)</em>(n/[n+1])</p>
<p>If we look at the last two terms together and let n=infinity and multiply them together:</p>
<p>(infinity^2 - infinity)/(infinity^2+infinity), since the bottom term is a whole infinity larger than the top term it pulls the entire function down to zero. Doing limits on my nspire CAS confirms this, if the “last” term is zero the whole string is zero.</p>
<p>[UPDATED x3] I’ll post here the answers everyone has listed so far in addition to some that I got:
Dice problem: 1/2 (explanation: <a href=“http://talk.collegeconfidential.com/act-preparation/1287931-act-math-section-february-2012-a-6.html#post13862783[/url]”>http://talk.collegeconfidential.com/act-preparation/1287931-act-math-section-february-2012-a-6.html#post13862783</a>)
Shaded regions: 18
Multiplying fractions problem as x gets greater and greater: 0 (explanation: <a href=“http://talk.collegeconfidential.com/act-preparation/1287931-act-math-section-february-2012-a-9.html#post13862977[/url]”>http://talk.collegeconfidential.com/act-preparation/1287931-act-math-section-february-2012-a-9.html#post13862977</a>)
Simplifying polynomial problem: (W+X)^2-(Y+X)^2
Circle inside circle radius: 1/2x
Large rectangle: 1/2
Slope point problem (slope was like 4/5 and you had to find an equal point): (x+5, y+4)
X intercept: (9,0)
Tan of angle: >0
Geometric series (12, -4, 4/3, -4/9): 4/27
Smallest fraction problem [a is between 2 and 4, b is between 4 and 6, c is between 6 and 8, and d is between 8 and 10… you have to find the smallest number possible given (a/b)(c/d)]: .2 (something is off with the numbers i used in this example, but the concept is right)
Distance, midpoint problem [I don’t remember the exact numbers, so I will use my own in order to show the correct method: endpoint was (2,6), midpoint was (-1, −3)]: the x value of the other endpoint was −4</p>
<p>Confirm that the multiplying fractions one is 0. If you disagree, wait until you take calculus and know what a limit is. [edit: thank you, it was annoying me that people disagreed]</p>
<p>For the expanding polynomials question, what was the original question? For some reason I remember putting (W+X)^2 + (Y+Z)^2. I had a plus, not a minus.</p>
<p>I don’t remember midpoint or distance question. Can someone expand?</p>
<p>Wait, nvm, that was for a different problem. The problem is worded incorrectly on here about where it is approaching. I am sure that it is 1. If u multiply the terms, which if you’re in calculus, you learn that you can do, and take the limit to infinity, it is indeed one. You don’t just keep multiplying the number to get smaller, the sequence was in groups. 2/3x3/4 is one half, and 3/4x4/5 is 3/5, which is larger, and thats what the problem wanted you to do. I confirmed with several smart people (lol) afterwards, and they confirmed what I said. its one, its just a badly worded ACT question that shouldn’t be present on a test of that nature.</p>
<p>nehccire I also put a plus, I think the question was of conjugate pairs (one of the multiplied binomials had a plus and the other had a minus). Can anyone confirm the original question?</p>
<p>ugot, that is true for any two terms but when you multiply 1/2 * 3/5 the result is 3/10 a number smaller than both 1/2 and 3/5…</p>
<p>@ugotserved834 Please list the question with how you thought it was worded. Until you can do that, the consensus on here (also with several smart people) is that it is 0.</p>
<p>@rdash, I think that ugot is trying to say that you only multiply the last 2 terms in the sequence, but I am almost 100% sure that that is incorrect.</p>
<p>wcclirl, please take off that 0 is confirmed, because it is not the right answer; the poster on here put the question wrong.</p>
<p>also lightning strikes was 240,000,000 right?</p>
<p>ok for the idiots who think that the answer is 1 for that problem, It is 0 (I have an A+ in calc BC so im pretty sure i know what a limit is). even if those numbers got closer and closer to 1, how the **** do you figure that it could ever approach when when it started with (2/3)(3/4). Every number in that sequence is less than one, so it must be constantly decreasing to 0</p>
<p>@ugotseved834, it is confirmed. If the question posted on here is wrong, you need to post the correct one, not just say that it is wrong with no evidence.</p>
<p>to be honest, I don’t really mind that you all think the answer is 0. it doesn’t affect me what the consensus is. The consensus is incorrect. I can’t provide the wording exactly, but I know it was not as simple as multiplying all of the numbers together (each set is independent from the set before it).</p>
<p>ugotserved. please explain how all fractions less than 1 somehow would ever even approach 1, when 1x something doesn’t even change the number, and these numbers were less than 1</p>