BB Page 551, #15

<p>Thanks a lot !!!
That’s the last revision before Saturday exam :D</p>

<p>anyone can help me answer such question? Plz. thank you guys so much</p>

<p>Did you try looking in [Consolidated</a> List of Blue Book Math Solutions](<a href=“http://talk.collegeconfidential.com/showthread.php?t=339734]Consolidated”>http://talk.collegeconfidential.com/showthread.php?t=339734)?</p>