Sqrt 13 and 1.1919919991... are irrational, meaning that they can't be described in a fraction of one integer over another, like 1/3, 45/44 or 57/107, these numbers are rational. Most irrationals are known constants like e or π, endless non-repeating decimals, or roots of non-perfect numbers like 13, 7, 5 or 2.
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if the x and y coordinates that mean that number is the solution to whatever the question is.
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If 3x + 8x + 4x = 6x + 63, then what is 5x + 23?
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90 degree angle because a right angle is always 90 degrees