Thanks for asking, C programming

13 Write a function f (a, b, n) that returns o if both a and b fall between o and n+1, nclusive. The function should return 1 otherwise. Assume that a, b, and n are all of type int. 14 Write functions that return the following values. (Assume that a and n are parameters of the functions where a is an array of int values and n is the length of the array a.) (a) The biggest element in a. (b) The average of all elements in a. (c) The number of even elements in a. 15 Write a function that computes the value of the following polynomial: x 3x2+6x 8. Write a program that asks the user to enter a value for x from the keyboard, calls the function to compute the value of the polynomial, and then displays the value returned by the function