6. Determine whether each of the following functions is one-to-one, onto, neither or both. (a) f : {0, 1}² → {0, 1}³. ƒ(x) = x0, i.e., append a '0' to the end of string 'x'. (b) ƒ : R → R, f(x) = –3x + 4 (c) f : R → R, f(x) = [x/5] %3D

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{1,5,10,15} and Y1 = {1,5,10,15,20}. Using the formal definition of a function, determine which of the following subsets of X1 × Y 1 correspond to the functions of X1 → Y 1. Justify your Problem 7. Let X1 = answer by providing reasons why each is or is not a function. 7(a) f = {(1,15),(5,10),(1,5),(10,1),(15,1)} 7(b) f = {(1,20),(5,1),(10,1),(15,5),(1,20)} 7(c) f = {(1,1),(5,1),(10,1)}