Deduce the expression when a set of numbers {[[$ -2 $]], [[$ -1 $]], [[$ 0 $]], [[$ 1 $]], [[$ 2 $]]} is entered into the function machine, and the output is

a) {[[$ -2 $]], [[$ -1 $]], [[$ 0 $]], [[$ 1 $]], [[$ 2 $]]}.



Answer: The expression is [[$ x $]] [[$ \rightarrow $]]

b) {[[$ 2 $]], [[$ 1 $]], [[$ 0 $]], [[$ -1 $]], [[$ -2 $]]}.



Answer: The expression is [[$ x $]] [[$ \rightarrow $]]

c) {[[$ -1 $]], [[$ 0 $]], [[$ 1 $]], [[$ 2 $]], [[$ 3 $]]}.



Answer: The expression is [[$ x $]] [[$ \rightarrow $]]