8
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Weapon of the sea, undented, times x or y minus the first, reversed.

3-4 triangle complete.

A bucky lemur nun.

Shakespearean poem less nonagon's sides.

Krypton minus vanadium. (omg i messed this up too, sorry)

In, at, of or pi.

Flags in tic-tac-toe position 3 and 8.

10010 (my b, messed this up)

Palindromic animals slammed in a net plus backwards epsilon.

Neutrons in carbon isotope with 20-minute half-life.

Knights and queens on a starting chessboard.

$(2.5x^3-28x^2+163x-6374)'''$

rvtugrra.

Hint 1:

In mathematics, x and y are often used to refer to a certain four-letter word.

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  • $\begingroup$ +1 for Krypton! $\endgroup$ – Omega Krypton Nov 1 '18 at 22:53
10
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Weapon of the sea, undented, times x or y minus the first, reversed.

A weapon of the sea is a trident, undented gives tri which means 3. x and y refer to an axis, minus the first letter xis then reversed is six. 3x6 =18.

3-4 triangle complete.

As found by @Omega Krypton 3,4,5 triangle by Pythagorean theorem.

A bucky lemur nun.

Anagram for 'an unlucky number' which is 13.

Shakespearean poem less nonagon's sides.

As stated by @AHKieran a sonnet has 14 lines and a nonagon has 9 sides therefore 14-9=5.

Krypton minus vanadium.

Krypton's atomic number is 36, Vanadium's is 23, so 36-23 = 13

In, at, of or pi.

Best guess for now is first two digits of pi since each word is two letters which gives 3 and 1. 3 -1 is 2 possibly or 3+1 is 4? Likely gives a two.

Flags in tic-tac-toe position 3 and 8.

As found by @JR_M using semaphore flags you get 5.

10010.

is 18 in binary.

Palindromic animals slammed in a net plus backwards epsilon.

A palindromic animal is a ewe, an epsilon backwards looks like a 3. Not sure from here with this one. net backward is ten, 10+3 gives 13.

Neutrons in carbon isotope with 20-minute half-life.

Carbon-11 has a 20 minute life and has 5 neutrons.

Knights and queens on a starting chessboard.

there are 6 (4 knights and 2 queens on a chessboard to begin). Also possible it is referring to the rank or file of there positions.

$(2.5x^3 - 28x^2 +163x-6374)'''$

The 3 apostrophes indicate third derivative of the equation which is 15.

rvtugrra.

rot13 on it gives eighteen.

Final Answer:

If you take all the numbers: 18-5-13-5-13--5-13--5-6-15-18 and translate using a1z26 you get REMEM_ER_EFOR. If I had to guess the 6th letters is a B and then the 9th letter is either a B or an M. If they are both Bs it is a misspelling of remember before, if the second letter is an m it gives remember me for... which is part of a lyric in fall out boy's song, centuries.

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  • 1
    $\begingroup$ (rot13) vs v erzrzore pbeerpgyl, n fbaarg unf sbhegrra yvarf $\endgroup$ – AHKieran Nov 1 '18 at 14:09
  • $\begingroup$ @AHKieran lbh qb vaqrrq erzrzore pbeerpgyl $\endgroup$ – Excited Raichu Nov 1 '18 at 14:09
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    $\begingroup$ (Also, I messed up the binary, it's fixed now.) $\endgroup$ – Excited Raichu Nov 1 '18 at 14:11
  • 1
    $\begingroup$ Yep, (rot 13) praghevrf is the answer. $\endgroup$ – Excited Raichu Nov 1 '18 at 14:59
4
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Very Partial Answer:

3-4 triangle:

5 of course! (Pythagoras Theorem)

Nickel minus Vanadium:

5 too! (Atomic number difference, see periodic table)

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4
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Partial Answer:

Flags in tic-tac-toe position 3 and 8.

If you are using semaphore flags, then this would be 5 because flags in tic-tac-toe position 3 and 8 represent the number 5.

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4
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Others can use this but:

x or y are axes/axis, minus the first = xis, reversed = six.
As already explained, weapon of sea is trident, indented is tri = 3.
$3 \cdot 6 = 18$

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