Is the condition x 0 necessary or sufficient or both


Question: Consider the proposition 2x + 5 ≥ 13.

(a) Is the condition x ≥ 0 necessary, or sufficient, or both necessary and sufficient for the inequality to be satisfied?

(b) Answer the same question when x ≥ 0 is replaced by x ≥ 50.

(c) Answer the same question when x ≥ 0 is replaced by x ≥ 4.

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Mathematics: Is the condition x 0 necessary or sufficient or both
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