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There is insufficient information for us to even begin to understand this question. Please edit the question to include more context or relevant information. There is no inequality in the question.
x2 = 16take the root square for both sides the result will be :X = +4 or -4
Not unless you have an infinite amount of time as there are an infinite amount of numbers that are solutions to an inequality.
Infinite.
None. -42 is a single integer, not an equation nor an inequality. So there are no solutions.