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Patrici33
we know that it is x<2 and x [tex] \geq 2[/tex]. and when x is less than 2 it is x^2+4. and when x is equal or greater than 2 it is x+4

so B.
Its the second one, x^2+4, x<2        x+4, x>=2, because the full circle on the graph represents >= and the empty circle represents <. 

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