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1 It can be the mark of an incorrect answer

2 It can indicate multiplication

3 It can represent an unknown variable in an equation

4 It is 10 as a Roman numeral

5 It can be doubled to XX for 20 in Roman numerals

6 It can be trebled to XXX for 30 in Roman numerals

7 It's expressed as x2 for x*x

8 It's expressed as x3 for x*x*x

9 It's expressed as 2x for x+x

10 It's expressed as 3x for x+x+x

11 It represents the slope of a straight line equation

12 It's the horizontal axis on the Cartesian plane

13 It and the the y axis are perpendicular to each other on the Cartesian plane

14 It has lines of symmetry

15 It has rotational symmetry

16 It will tessellate

17 It's (X) for 10,000 in Roman numerals

18 It forms the diagonals within a square

19 It can fit exactly within a circle

20 It creates equal vertical opposite angles

21 Its best friend is y because they always play a double act

22 It marks the spot of the hidden treasure on a map

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12y ago

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