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{ (a) } f: z \rightarrow z_{1} f(x)=7 x-7 \\ \text { (a) } f: \mathbf{R} \rightarrow \mathbf{R} \text { . } f(x)=7 x-7 \end{array} (c) A = {a, b, c, d,e}. f: P(A) → {0,1,2, 3, 4,5}. f(2) = |2|. It maps a set to the number of elements it contains.

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