#12 :
14*8*5 + -13*-1*-10 + 0*3*-2 - 0*8*-10 - -13*3*5 - 14*-1*-2
560 + -130 + 0 - 0 - -195 - 28
597 (Answer C)

#13:
-18*1 - 3*4
-18 - 12
-30 (Answer B)

#12

K = A(E*I-F*H) - B(F*G-D*I)

A(E*I-F*H) = 14(8*5 - (-1*-2))

-B(F*G-D*I) = -(-13)(-1*10 - (3*5))

Add to get 597

#13

-18*1 - (3*4) = -30.



As long as we're on matrices, how about we do something closer to the realm of differential equations?

1.) B
2.) D
3.) A
4.) C
5.) D
6.) A
7.) C (Please word this a little nicer next time)
8.) D
9.) C
10.) Unsolvable due to variations in rates of interest, premiums, coverage amounts and other details. I mean, seriously, you're asking about how much to pay for car insurance. The only way I see this question having an answer is if you're asking how much every car owner should pay to cover the theft of one car. If that is what you're asking, C
11.) B
12.) A
13.) C (Because I really, REALLY have no idea what this thing is)
14.) B
15.) D
16.) D
17.) B
18.) B
19.) C
20.) D

I'm rusty with my inequalities (and what the crap are those xCy problems?) but here are my answers for the final set of this round:

1. B
2. D
3. C
4. C
5. D
6. A
7. C (it feels like this answer is leaving out a step though)
8. B
9. B
10. C
11. B
12. A
13. A (googled it, had no idea beforehand what it was)
14. B
15. D
16. D
17. B
18. B
19. C
20. D

1-B
2-D
3-C
4-C
5-D
6-A
7-C
8-B
9-C
10-C
11-B
12-A, I sopose deck is composed of 52 cards
13-A, I didn't know about the notation so i searched what it means
14-B
15-D
16-D
17-B
18-B
19-C
20-D

Round 4 answers:

1. B
2. D
3. C
4. C
5. D
6. A
7. C
8. B
9. B
10. C
11. B
12. A
13. A (Did not recognize the notation without searching.)
14. B
15. D
16. D
17. B
18. B
19. C
20. D

1. b
2. d
3. c
4. c
5. d
6. a
7. c (hard to understand...)
8. b
9. c
10. c
11. b
12. a
13. a (same... googled..)
14. b
15. d
16. d
17. b
18. b
19. c
20. d

I guess I feel good about having taken Probabilities and Statistics, and therefore vaguely recognize permutation / combination notations? (Even though that's about all that I really remember from it...)

1. B
2. D
3. C
4. C
5. D
6. A
7. C
8. B
9. B
10. C
11. B
12. A
13. A
14. B
15. D
16. D
17. B
18. B
19. C
20. D

Could you check how many entries share your answer, and report that to me?

My post: 129

Other posts:
126 - #3, 8, 9, and 13 are different
127 - matches
128- #9 is different
130 - #9 is different
131 - matches

OoooOps...
Looks like i missed this round.... damn... :(
Think i just forgot.... oh well...

Well, I don't know. He didn't give any points for the previous round yet...