Help with these Math IIC questions?

Test Preparation
1

<p>These are from Barron's, but I didn't find the explanations for these questions satisfactory, or I just didn't get it.</p>

<p>Now, there are a lot of questions so I don't expect you to help me with all of them, but any amount would be greatly appreciated</p>

<p>Remove the space between . and com in the links to see the pictures</p>

<p><a href="http://i.imgur"&gt;http://i.imgur&lt;/a>. com/zVNpPSF.jpg
Answer: D</p>

<p>How is choice D a reflection across the line y = x?</p>

<p><a href="http://i.imgur"&gt;http://i.imgur&lt;/a>. com/bpSjR7F.jpg
Answer: B</p>

<p>When you graph this on the calculator, the function stops at y = 1 and comes back down. So how is y > 0?</p>

<p>Now please explain the following questions, because I just don't get how to do them:
<a href="http://i.imgur"&gt;http://i.imgur&lt;/a>. com/M5MmDgl.jpg
<a href="http://i.imgur"&gt;http://i.imgur&lt;/a>. com/iBSShdy.jpg
<a href="http://i.imgur"&gt;http://i.imgur&lt;/a>. com/9p7xrBp.jpg
<a href="http://i.imgur"&gt;http://i.imgur&lt;/a>. com/YGv4YUi.jpg
<a href="http://i.imgur"&gt;http://i.imgur&lt;/a>. com/U3NZIbk.jpg
<a href="http://i.imgur"&gt;http://i.imgur&lt;/a>. com/bJw8Zh0.jpg
<a href="http://i.imgur"&gt;http://i.imgur&lt;/a>. com/NJbdXF8.jpg
<a href="http://i.imgur"&gt;http://i.imgur&lt;/a>. com/Vg23xAl.jpg
<a href="http://i.imgur"&gt;http://i.imgur&lt;/a>. com/g6fJ04w.jpg
Answers:
38. B
39. C
42. B
44. B
45. D
48. B
10. D
14. D
18. E
21. B</p>

2

<p>The links to images aren’t allowed</p>

3

<p>How am I supposed to show pictures of the questions then?</p>

<p>Unless you mean you can’t see them, you have to remove the spaces between the . and com to see the images @‌viphan </p>

4

<p>the second one with answer B makes sense. If you have x^-2/3 that is the same as 1/x^2/3. Let y be equal to 1/x^2/3.</p>

<p>Let y = 0</p>

<p>Take the log of both sides u get. </p>

<p>log 0 = …(some ■■■■)</p>

<p>You can’t have a log of zero, furthermore, this is a reciprocal. see the eqtn like this. (x^3)^½ which is the sqrt of x^3. If x to the power of three is negative, the values will imaginary, as u cnt sqrt a negative. Therefore, it has to be only on the positive side of the x axis, and cannot be less than zero, therefore B is the right answer.</p>