e and f. thank you

(20 pt) For all real numbers x and y, max(x,y)-x+y2r-yl and min(x,y)-'ty-la-y| (20 pt.) For any positive integer n, n is even if and only if 7n + 4 is even. e. f. Hint: To prove that a biconditional statement of the form pq is true, you must show that p q and q p are both true. For example, to prove that for any integer n, n is odd if and only if n2 is odd, you must show that (1) if n is odd, then n2 is odd, and (2) if n2 is odd, then n is odd