I need the following answered!

Part I: Functions (25 pt.) 1. (20 pt., 4 pt. each) For each of the following functions, determine whether the function is: Injective (one-to-one). .Surjective (onto). Bijective. Invertible. x5 + 1. f: R+ R+ such that f(x) a. b, f: R R such that f(x) = |x/2j. c. f: R R such that f(x)- d, f: R-(0) R such that f(x)-x+1. e, f: z z z such that f(x,y) = x + y. 2. (5 pt., 2.5 pt. each) Let g be a function from a set A to a set B and let f be a function from set B to a set C. a. If both f and g are injective (one-to-one), then f g is also injective. Explain why. b. If both f and g are surjective (onto), then f g is also surjective. Explain why