7. Prove that n² + 12 2" for any integer n such that 1≤ n ≤ 4. 8. Find a counterexample or use proof by cases to prove t
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7. Prove that n² + 12 2" for any integer n such that 1≤ n ≤ 4. 8. Find a counterexample or use proof by cases to prove that [x -y] = [x]-lyl 9. Prove if the following functions are onto or not: a. f:Z xZ-Z, f(x) = m+n+1 b. f:Z xZ-Z, f(x) = m² -n² c. f:Z xZ-Z, f(x) = ml - Inl