<p>For the first one, why is the answer C) 12?
I know you can use the counting principle for 3 x 2 x 1 and then multiple it by 2 since they play twice... but I didn't think you could use that for this problem? Or is it just a coincidence? If thats not how you do it, can someone explain?</p>
<p>For the second one, I subtracted 4500 from 15000, and multiplied it by .4 and got 4200 but thats wrong. Where did I go wrong? Since it has to be BOTH hardcover and fiction I thought you could just get rid of the non fiction </p>
<p>For the 1st question, assume the teams are A, B , C ,D
Then the matches go like that:
A-B
A-C
A-D
B-C
B-D
C-D
Thath’s total of 6 different games, since every match is played twice, you get a total of 12.</p>
<p>In the 2nd question, you got a total of 6000 hard cover books, 2000 of them are non fiction, that means that 4,000 of them are fiction. (I think so lol).
Hope that helped.</p>
<p>For the 3rd question, you know that the coordinates of point A are (-4,3) so you only have to figure out that a line from the center of a circle is perpendicular to a line tangent to that circle ( draw a line from the center of the circle to point A). Now the slope of the line from the center to point A is 3/-4. That yields the slope of line L which is 4/3. I hope that helped.</p>
<p>In the 2nd one you took out all the non-fiction and then just checked how many of the books left are hard cover but then the precentage is wrong because you are taking it without all of the paperbacks. You 1st need to check the total number of hard covers to paper back which is 6,000 hard cover (Total) and 9,000 paper back. and then you can see that you have 4500-2500 = 2,000 of the non-fiction that are hardcover and then you take that number off the total number of hard covers 6,000-2,000=4,000 (Btw, is that even the right answer?)</p>
