#14 please

Let x be odd andL For Exercises 9-46, prove the given statement. 9. Ifn 25, 100, or 169, then perfect square an 10. If n is an even integer, 4 n 12, then n is a sum of two prime numbers. 11. For any positive integer n less than or equal to 3, n! 2". n is a perfect square and is a sum of two perfect squares 13. The sum of two even integers is even (do a direct proof). 14. The sum of two even integers is even (do a proof by contradiction). 15. The sum of two odd integers is even nd an odd integer is odd