Respuesta :

CSMedrano

Answer:

4z-12

Step-by-step explanation:

the perimeter is the sum of all sides

so

[tex]P=(z+3)+(z-9)+(z+3)+(z-9)\\\\P=z+3+z-9+z+3+z-9\\\\P=4z+6-18\\\\P=4z-12[/tex]

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good job