In the expression "2x + 3", which part is the variable?, 2, X, 3, 4, What geometric shape area does x² represent?, Rectangle, Triangle, Square, None of the Above, what is meant by 'Constant'?, A fixed numerical value, A letter with fixed value, mathematical operation of numbers, none of the above, According to the 'Geometrical Significance' section, what does the term $x^2$ visually represent?, Area of Square, Area of Rectangle, Area of circle, none of the above

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