Answer
(a) 4
(b) 2
(c) 5
Work Step by Step
We plug in the $x$ values into the the piece of the graph whose interval includes that $x$ value:
(a) $f(-2)=(-2)^{2}=4$
(b) $f(0)=2$
(c) $f(2)=2(2)+1=5$
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