blue book math problems, I'm stumped..

Test Preparation SAT Preparation
1

<p>Test #4, section 2, problem 2 (yes I kno I'm stupid..)</p>

<p>A,B, and C are points on a line in that order. If AB=30 and BC is 20 more than AB, what does AC equal?</p>

<p>(a) 50
(b) 60
(c) 70
(d) 80 (right answer)
(e) 90</p>

<p>Clueless on how to do this one </p>

<p>Test #4, section 2, problem 11 (again i feel stupid)</p>

<p>The sequence (Z W Y Z) may be changed in any of 2 ways. Either two adjacent letters may be reversed. What is the least number of such changes needed to put the letters into alphabetical order from left to right?</p>

<p>(a) 2
(b) 3 (right answer)
(c) 4
(d) 5
(e) 6</p>

<p>I chose a cuz can't u change x and z, then x and w?</p>

2

<p>How can you not get the first one?</p>

<p>If A, B, and C are points in a line in that order - then AC = AB + BC
AB = 30
and
BC = 20 + AB => 20 + 30 => 50</p>

<p>So, AC = AB + BC => 30 + 50 = 80</p>

<p>The second one is even easier. ;) </p>

<p>=>Z W Y Z
=>W Z Y Z
=>W Y Z Z</p>

<p>
[quote]
I chose a cuz can't u change x and z, then x and w?

[/quote]
</p>

<p>What X?
[quote]
The sequence (Z W Y Z)

[/quote]
</p>

3

<p>How does ac=ab+bc?</p>

4

<p>Ummm... if they are in a line, then it just does. Kind of obvious. Take a look at this:</p>

<p><a href="http://img295.imageshack.us/img295/9421/linebi0.jpg%5B/url%5D"&gt;http://img295.imageshack.us/img295/9421/linebi0.jpg&lt;/a&gt;&lt;/p>

5

<p>omg that's so obvious, sorry havn't recovered from summer break</p>

6

<p>I took the same practice test and got in the 780-800 range for math. The question I got wrong as #2. So, it's okay to get that one wrong.</p>