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8 has vertical symmetry.
No
yes it is
No you cannot have an irregular octagon with three symmetrical lines and just to let you know that 5 billion - 2 = 4,999,998 and you can do an endless sum with all four number operations - + % x and 5 kerzillibillion - 10 kerzillibillion = -5,000,000,000,000,000,000,000,000.
Only if it's drawn as a straight line. If the horizontal line at the base, and the sloping line at the top are added, it is not symmetrical.