5. (9 points, 3 points each) For each of the following functions, determine if it is one-to-one, onto, a bijection, or neither one-to-one nor onto. a. f: RR f(x) = x2 + 2x + 6 + 4 b.f: RR x > 2 J (X) = 4x+8 f(x) = {2x + 4 x 2} f(s) = The string formed by swapping the first and last characters of s. Example: f(reap) = pear