Official Math 2C Thread

Test Preparation
41

<p>ohmigod.
I though ray was a line with no definite ends.
How could I confuse the definitions.</p>

<p>Yeah, it's a line and a point.
you ARE right. sorry</p>

42

<p>I put -k too.</p>

<p>Also how about that question with the various equations set to zero and which one would be the same if you replaced x with -x??</p>

<p>Ahh Im starting to think I did really bad...</p>

43

<p>yup -k is right</p>

44

<p>It was the odd function, forgot exactly which one it was though.</p>

45

<p>I put the powers of 5 3 and 1.</p>

46

<p>are you sure? I really hope so.
i agree with -k.
I really hope it's the odd fuction.</p>

47

<p>Which of those >0 had to be true?</p>

<p>I went for x^2 -2x + 2 > 0 only</p>

48

<p>it had to be the odd function. if you put in -x, you get -1(f(x)). since -f(x) = 0, you can divide -1 by both sides to just get f(x) = 0, which will give you the same solutions.</p>

49

<p>wait. i didnt take the test, but isnt the definition of an even function f(x)=f(-x)... so how did you get odd? or maybe the question was a different...</p>

50

<p>yes, that's correct. Using x=1 for the other ones provides a counterexample. This one factors:</p>

<p>(x-1)^2+1>0, which is always true.</p>

51

<p>more questions coming to me...a cylinder one the answer was 37.5
then 1 about a car, i got 3/20
also a worker makaing 300$, got like 1,667
also one with 3 boxes on a graph of lnxsquared i think i got 21 but dont really remember</p>

52

<p>The same solutions one was indeed the odd one, which was like</p>

<p>x^5-3x^3+x=0.</p>

53

<p>37.5, 3/20 and 1666.67 are right
the ln x^2 I think is 15.5</p>

54

<p>Ohhh I get it now. <em>slaps self for silly mistakes</em></p>

55

<p>So does anyone have the exact curve from the previous couple of years?....according to sparknotes its around 43, according to some others its around 45...but i doubt its as low as 43....but i have no idea so....neone?</p>

56

<p>joe, if i remember correctly it was (ln64 X 2) + (ln36 X 2) + (ln16 X 2)? = 21?</p>

57

<p>Which of those >0 had to be true?</p>

<p>I went for x^2 -2x + 2 > 0 only</p>

<p>I also went for x^2 -2x + 1</p>

<p>...am i right?</p>

58

<p>also i think i mita screwd up #2...the parabola problem..sadly..i think misread it, was the answer a>0? or sumthin
also the (radicalt, t) question it hink the answer was part of a parabola.....but no idea...</p>

59

<p>It was 2 * (In 4 + In 16 + In 36)</p>

60

<p>What about question #1...i thought that was REALLY hard ;)</p>