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Compare features of functions

Problem

f is a function defined on all real numbers. Its formula is given below.
g is a function defined on all integers between 3 and 3 (inclusive). Its values are given in the table below.
Which of the features are shared by f(x) and g(x)?
Choose all answers that apply:
f(x)=2x6
x321  01 2 3
g(x)121516151270
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