Use the graph of f(x) to find each of the following:
13) f(1) =
14) f(-2)=_
15) f(-4)=_
f(x)
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16) f(0) =
17) f(3) =
18) f(-1) =
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-3
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-1
-2
-3
-4
1 2 3 4 5
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19) f(-3)=
20) f(1) =
21) is fix) a function?