Math problems

Test Preparation SAT Preparation
1

<p>This one is extremely confusing
<a href="http://m1271.photobucket.com/profile/myoliewufan1995?pbauth=1_uLEBonVPfaLdh1h3YMYz2RZI6oLefSjMNS1N%2Bi112auMK7%2Fug0s51%2BuI3N2RVUQOrkxImArbpn%2BiYc%2F%2B7%2FOTBHgapYtLhvBnHgORzH9enLs%2B8SJF7FjX%2Fszk0%2BZCfI1nmofbB4z4dZffgRj1owCxbAYuJcOgVGJC1Emese9sgTvafGOWFAeAXg%3D%3D%5B/URL%5D"&gt;http://m1271.photobucket.com/profile/myoliewufan1995?pbauth=1_uLEBonVPfaLdh1h3YMYz2RZI6oLefSjMNS1N%2Bi112auMK7%2Fug0s51%2BuI3N2RVUQOrkxImArbpn%2BiYc%2F%2B7%2FOTBHgapYtLhvBnHgORzH9enLs%2B8SJF7FjX%2Fszk0%2BZCfI1nmofbB4z4dZffgRj1owCxbAYuJcOgVGJC1Emese9sgTvafGOWFAeAXg%3D%3D&lt;/a&gt;&lt;/p>

2

<p>Assuming the very first one, the image is a little small but this is what I read it as:</p>

<p>If x < y < 0, which of the following must be true?</p>

<p>I: x+1 < y+2
II: 3x < 2y
III: x/y > 1 (I’ll skip typing the answer choices)</p>

<p>I: x is less than y, so x+1 < y+1 < y+2, so I is true.</p>

<p>II: This is also true. 3x < 2x < 2y.</p>

<p>III: This is true. If you multiply both sides by y (and reverse the inequality sign), you obtain x < y. Hence, III is true if and only if x < y, so it must be true.</p>

<p>Hence the answer is E, I,II,III.</p>

3

<p>You should have subtracted b ( or 30 ) before you divided by 2. </p>

<p>Sum = 100
Median (b) = 30</p>

<p>2( a + b) + 30 = 100
2( a + b) = 70
( a + b) = 35</p>

4

<p>Also, #15 (the one with the tournament) can easily be solved by noting that there are 6C2 = 15 ways to choose two players for any game. Each player plays twice, so the answer is 2(6C2) = 2*15 = 30.</p>