April 4 ACT ------- Math

Test Preparation ACT Preparation
61

<p>^agreed</p>

<p>i got 4 for the one with the w, x, z
1, 4
2,3
3,2
4,1</p>

<p>i solved them all out and they all worked</p>

62

<p>^ I’m pretty sure that one was 2. Only 2,3 and 3,2 worked when I did it.</p>

<p>Does anyone remember the one that was asking for the expression to find the number of weeks after which person A’s salary would be equal to person B’s?</p>

63

<p>it had to be 2. I tried 1,4 and 4,1 and they didn’t work. maybe you miscalculated? I remember feeling very confident about that one in particular.</p>

64

<p>For the x,y, z problem I got 4 because
2,3,1,6 worked for me.
but right now i cant even remember what the problem was asking.</p>

65

<p>I’m 100 percent sure it’s 4,1.I cud explain it but I forgot what it was asking.</p>

66

<p>what about the abcd geometric sequence question?
i got (A), w/e that was.</p>

67

<p>That one was a3bc4d. 100 percent sure. Sorry no carot signs…on iPod.</p>

68

<p>It was definitely 2. It asked for numbers up to 5 and they had to be positive integers. So you can’t have 0 and 5 or 5 and 0. The combinations 1,4 and 4,1 came out to be 16 and the ones with 2,3 and 3,2 came out to be 64.</p>

69

<p>yup that was definitely choice (A)</p>

70

<p>it was a3bc4d</p>

<p>I think it was [A]</p>

71

<p>It said the two positive integers had to add up to 5. So, the only combinations that do that are:</p>

<p>1 - 4
2 - 3
3 - 2
4 - 1</p>

<p>If you said 4, you’re claiming all 4 of the above sets satisfy the conditions given…which they don’t. Only two of them work.</p>

72

<p>Galib, I got rational plus rational=rational also</p>

73

<p>i dont think rational plus rational= rational was an option… i did irrational + irrational= irrational</p>

74

<p>I chose rational plus rational is rational.
The option for irrational was irrational times irrational = irrational, which isnt true because the square root of 2 times the square root of 2 is 2 (a rational number)</p>

<p>i guess i missed that the two numbers had to equal 5…so i got 6 and 1 along with 2 and 3. wow. i feel stupid for missing something like that, but i ran out of time so i was trying to get through all of them.</p>

75

<p>what was the one with the ratios of the triangles and parallel lines? like ac to ce. I put 1:1 but ratios have never been a strong point for me</p>

76

<p>what was the answer choice for the rationales one?</p>

77

<p>For the last problem the answer was 2root2 right?
because the sides of the cube was 4 so u can find the diagonal (root32) and divide it by 2 to give you the radius…
somebody want to clarify this?</p>

78

<p>Rational one was E.</p>

<p>David, you’re wrong. After finding the diagonal of a square, you need to use that to find the diagonal of the cube and divide that by 2 to get the radius of 2 radical 3.</p>

79

<p>i heartily disagree , the diagonal of the square is equal to the diagonal of the cube.</p>

80

<p>The only picture I can find: <a href=“http://www.ul.ie/~cahird/polyhedronmode/cube_in_sphere.gif[/url]”>http://www.ul.ie/~cahird/polyhedronmode/cube_in_sphere.gif&lt;/a&gt;&lt;/p&gt;

<p>The diameter passes through the center of the circle, and the diagonal of one of the squares clearly doesn’t. That’s why you needed the diagonal of the cube itself.</p>

<p>What you are thinking of is a simple chord but definitely not the diameter. Sorry to break it to you. :&lt;/p>

<p>Edit: An easy way to look at is this: <a href=“https://faculty.digipen.edu/~jhanson/geometry/symmetry/images/cube-label.jpg[/url]”>https://faculty.digipen.edu/~jhanson/geometry/symmetry/images/cube-label.jpg&lt;/a&gt;&lt;/p&gt;

<p>For example, you are claiming that (in that type of picture) 4->2 = 4->6 and yeah that’s not right.</p>