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If (x\in (-\infty,\infty)), where will shading appear on the number line?

Answer and explanation

Correct answer: On the entire number line

The direct answer is option C: the entire number line. The interval (-∞,∞) means every real number, with no lower or upper restriction. Infinity is not an endpoint that can be reached; it simply indicates that the set continues without limit in both directions. Option A, only on the left, represents a set extending toward negative infinity but does not include all positive numbers. Option B, only on the right, similarly misses negative numbers. Option C is correct because every point on the real number line belongs to the interval. Option D, nowhere, would represent an empty solution set, but this interval is the opposite of empty: it contains all real numbers. On a drawing, there is no endpoint circle; shade the complete line from left to right. Memory cue: both infinities together mean ‘all real numbers.’

Related tags

Linear-InequalitiesEntire-LineAll-Real

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