<p>I'm not a math guy, so I'm guessing something I did was wrong.</p>
<p>In the first edition of the BB, practice test 7 section 8 question 13, I calculated the slope as 1/2. The rise/run came to 10-6 over 11-3. So 4/8, right? But apparently the answer is B, 1/4. What am I doing wrong?</p>
<p>In section 5, question 16, I simply don't know how to find z and y. Is there some theorem I am forgetting?</p>
<p>Finally, how would I solve number 15 and 16 in section 2? I can tell there is some connection somewhere, but I'm having trouble identifying it.</p>
<p>Thanks so much for helping!</p>