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What is the output of this function when the input is
4
?
ref_doc_title.

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Not feeling ready yet? These can help:
Skill IconBB.1Identify functions
Skill IconBB.2Identify functions: graphs
Skill IconBB.4Find values using function graphs
Skill IconBB.5Complete a table for a function graph
Skill IconCC.1Evaluate a linear function
Skill IconDD.4Evaluate a nonlinear function