4. Consider the following recursive algorithm. ALGORITHM Q(n) /Input: A positive integer n if n = 1 return 1 else return Q(n 1) +2 * n 1 a. Set up a recurrence relation for this function's values and solve it to deter- mine what this algorithm computes. b. Set up a recurrence relation for the number of multiplications made by this algorithm and solve it. c. Set up a recurrence relation for the number of additions/subtractions made by this algorithm and solve it