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3. Prove by contrapositive: Let n ∈ N. If n^3−5n−10>0,then n ≥ 3. 4. Prove: Letx∈Z....

3. Prove by contrapositive: Let n ∈ N. If n^3−5n−10>0,then n ≥ 3.

4. Prove: Letx∈Z. Then5x−11 is even if and only if x is odd.

4. Prove: Letx∈Z. Then 5x−11 is even if and only if x is odd.

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