Need help with all 3 please and thank you !

An integer n is said to be even if and only if there exists an integer k such that n=2k. Examples: 6 is even because 6=2(3) In other words, an even number can be divided by 2 without a remainder. Write a function in C++ named isEven that takes an integer n and returns true if n is even or false otherwise. 2: (5 Points) Write a C++ function named isOdd that takes an integer n and returns true if n is odd or false otherwise. 3: (5 Points) A positive integer d is called a divisor (factor) of an integer n if and only if the remainder after n is divided by d is zero. Write a C++ function named numOfDivisors that returns the number of divisors (factors) to an integer n