Subcategories

• Workout 1A (Algebra)

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  G

  For the Your Turn, I noticed that -8 works also (instead of 7.) (-8)^3+(-8)^2=56*-8. 4096 is also a valid answer to the question.

• Workout 1B (Algebra)

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  E

  Is there a typo in the mini question, because answer options 3 and 5 are identical.

• Workout 2A (Geometry)

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  @FoxInABush

  Maybe your keyboard doesn't work, or something's wrong on your end.

• Workout 2B (Geometry)

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  No new posts.
• Workout 3A (Combinatorics)

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  G

  so another thing is that I don't know if it was a typo on the last graph or if I just misunderstood, because it said 2 sub 1, for instance, was 2. But, I'm pretty sure it should just be 1, since there's only one way for a one digit number to end in 2. Also, the equation said that 7sub(i+1) = 2*(2 sub i). But, it said 7 sub 2 = 2, but according to the equation it should be 2*2=4. I thought maybe they included they're symmetrical pairs, like 2 sub i on the graph included 2 sub i plus 8 sub i, but that was definitely not the case according to the solution.

• Workout 4A (Algebra)

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  First, question 8 of the challenge.

  I feel like I might just be misunderstanding what the question is asking but I think “how many people will know about the rumor on the 7th day” is a bit ambiguous since it can refer to the number of new people who are told on that day, which seems to be what the question is actually asking, or the number of total people who know about it at the end of the day, which is my interpretation of it. So my calculations were that there were 16038 new people told and 8019 people who already knew before, so that 24057 people know about the rumor on the 7th day.

  Second, question 20 is also a bit weird. As it ignores the fact that V can be 0 as it is not present at the start of either TUV or UVT. Using this fact we can find an answer that is even smaller than 148. I think 130 is the actual solution to this question as
  301-130=171 which is a palindrome.

• Workout 5A (Number Theory)

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  Since 2021=2025-4=45^2-2^2, which means that 2021 can be written as (45+2)(45-2)=43*47. It's more faster than guessing the numbers and it's more easy to memorize. Although not all numbers can be solved that way