Only need help with b,d,f and h

Prove each statement. (a) If x is an integer, then x2 + 5x-1 is odd. (b) If x and y are real numbers, then max(x, y) + min(x, y) x +y If integers x and y have the same parity, then x + y is even. The parity of a number tells whether the number is odd or even. If x and y have the same parity, they are either both even or both odo. (d) For any real number x, Ixl 0. For any real number x, Ixl z x and [xl 2-x. You can use the fact proven in the previous problem that for any real number x, xj 0. For real numbers x and y, lx +yl s Ixllyl You can use the fact proven in the previous problem that for any real numberz z s I and-z s 1 (g) For integers x and y, if xy is odd, then x is odd and y is odd. (h) Let x and y be two integers. If xy is not an integer multiple of 5, then neitherx nor y is an integer multiple of 5