I don't get this SAT problem?

SAT and ACT Tests & Test Preparation SAT Preparation
#1

<ol>
<li>A cartographer is measuring the straight line distance between five different towns. Te towns are arranged in such a way that any given line connecting two of the towns will not pass through any of the other towns. How many such straight line distances must she measure?</li>
</ol>

<p>A.4
B.5
C.7
D.10
E.25</p>

<ol>
<li>If 200 inches of rainfall were expected to fall during all of 1998, what percent of the expected yearly rainfall was reached during this 30 day period?</li>
</ol>

<p>A.56%
B.42%
C.28%
D.14%
E.7%</p>

<ol>
<li>The lengths of two sides of a triangle are 5 and 7. If the length of the third side is an integer, what is the least possible perimeter of the triangle?</li>
</ol>

<p>A.)12
B.)13
C.)14
D.)15
E.)17</p>

<p>Thanks.</p>

#2

<p>1) The towns are the vertices of a pentagon. The answer is B.</p>

<p>2) Typo?</p>

<p>3) Triangle rule. The third side of a triangle cannot exceed the sum of the other two sides. The third side of a triangle also cannot be less than the difference of the other two sides. </p>

<p>2 < third side < 12</p>

<p>So the third side is 3. </p>

<p>3 + 5 + 7 = 15. D.</p>

#3

<p>Sorry IceQube but I have to correct you here for the first question:</p>

<ol>
<li></li>
</ol>

<p>The first question says that there are five different points but none of them are collinear. Now how many different lines can be drawn from each points to other four points?</p>

<p>From first point, we can draw 4 lines to other four points.
But from second point, we can only draw 3 lines because one line from this second point to first point is already drawn.</p>

<p>Similarly, the no. of lines drawn from other three points are 2, 1 and 0.</p>

<p>so the answer is 4+3+2+1 = 10</p>

#4

<p>^Oops, I forgot about the second part of the problem! Thanks for correcting me - I don't want to mislead anyone :).</p>