June 2009 ACT Math Discussion

<p>Yes charlie brown I got the answer that was longer than all the others, it was E. and involved law of cosines</p>

<p>i said not enough info too, im not sure though</p>

<p>It was 1:3.</p>

<p>You just need to look at the picture and put the triangles together to make 3 paralellograms.</p>

<p>The answer (in my experience) is NEVER not enough info.</p>

<p>The one involving law of cosines was the last answer, the longest one.</p>

<p>for the x could only equal -3, that meant that -3 was a double root, so the quadratic was (x+3)(x+3) –> x^2 + 6x + 9 is the final thing, so m = 6…aaaaaaaaaand I just realized I got that wrong.</p>

<p>ya i got 1:3</p>

<p>and choice e for cos question</p>

<p>yes you can do the shaded rectangle one. you needed to count the different parts of the unshaded area and they added up to 3. I an positive it was 1:3</p>

<p>1:3 here, too,</p>

<p>Ya…i had no idea how to do that one matok…but ya chair is prbly right</p>

<p>Crazy side note…ALWAYS go to the rest room b4 the test I got so sick toward the middle of the math test I almost just gave up. Anywho, I totally bombed math this time but thank God Rice and WashU superscore.</p>

<p>How did you know n = 9?</p>

<p>The format of the question was x^2 + mx + n = 0.</p>

<p>haha.
10 charr</p>

<p>was there an answer that was 3.4?</p>

<p>What about the question with the two intersecting chords?</p>

<p>I put not enough info</p>

<p>yup. the answer was actually pi but it asked you to round.</p>

<p>i had not enuff info at first but then i reworked it and figured it out. i don’t remember what though</p>

<p>mabsjenbu, i think the chord was 60 degrees. it was an isoceles triangle (the two radii are equal) so the other angle is also 30 degrees, meaning the arc is 60 because it’s double when the angle isn’t central</p>

<p>for the chord question i got 60 degrees… you need to use supplementary angles. if you add up all the angles its 60+60+120+120 which is 360 (degrees of a circle)</p>

<p>1:3
560 (larges)
8 lines of symmetry
3.14 (something with the glass)
4 (det)
how much went to charity it was like $3 an hr (2hr for small/3hr for large)
240 (avg)
3:2:1 (jerome kevin seth)
(5,0) (the square 3cm side)
384 (surface area of cube)
intersecting lines
angle was 90deg
missing side was 12 (gave u like 20 for h, and a 3,4,5 tri)
3 the area of the rect think with kA
(a/c) for some sin/cos/tan thing - letter B
30tan52
60 deg chord
goes through quad 1, 3, 4
add 18 red marbles (very similiar to a practice test question)
circle was rad38 center was like (5,0)
ice rink 16 + 8pi
rad(16+x^2)
to make the equations infinite times by 6 (2x-y=8 and 6x-3y=4a)
pass ball around 5th</p>

<p>how much went to charity it was like $3 an hr (2hr for small/3hr for large)
what about the pie chart was that 1/3
add .1 to slope = .22?</p>

<p>Chair is right 60 degrees. The first triangle was a 60-60-120. then to find the chord u need the find the parallel angle or whatever with the 120, so 180-120 = 60</p>

<p>no i think that was in the science</p>

<p>wow i guessed on a lot and got most right.</p>