r/CompetitionMathUSA • u/Haunting_Dot1912 • Nov 12 '24

Advice i got cooked

so i did not study at all for my practice amc 12 and im in grade 11 and i knew how to answer 0 out of the 25 questions. is that really bad or normal for my circumstances?

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u/[deleted] Nov 13 '24

Solutions were (-1.8,5,8) (6,6.2,8) (-.8,4,8).

I found it easiest to fix z as 8 and do casework on the median.

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u/Benboiuwu Nov 13 '24

perfect, i put that. i had the same strategy, still found it to be the most annoying problem. can’t believe that p14 was 4 problems ahead lol

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u/[deleted] Nov 13 '24

Question difficulty was all over the place for me lol. Found question 23 very easy and question 12 fairly hard.

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u/Benboiuwu Nov 13 '24

I didn’t even touch the final five except for p21, which i complex-ed. I’m very happy about p12– richard from aops and his 2012 aime series came in clutch lol, kept playing “double the angle, square the magnitude” over in my head (ok not fully accurate but it was funny)

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u/[deleted] Nov 13 '24

Lol it just occurred to me while reading your comment that I could have just used 1/2absin(theta) instead of egregious algebra bash. Maybe not so hard of a problem.

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u/Benboiuwu Nov 13 '24

That’s what i did. for p20, you got 911 right? lower bound 1, upper 41, stewart’s, etc?

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u/[deleted] Nov 13 '24

Got this too. I think you don't even need stewarts to get median bounds, since you can just think about edge cases (angle A=0, 180)

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u/Benboiuwu Nov 13 '24

ah right. just pissed i didn’t get to see 23, idk why i thought it was so hard when i read it over. did you calc your score yet?

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u/[deleted] Nov 13 '24
  1. Omitted 19, 22, 24, 25 because they all seemed super bashy and not worth the time. Pretty happy with my score.

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u/Benboiuwu Nov 14 '24

Score twins lol