Respuesta :

konrad509
[tex]\dfrac{x}{9}=\dfrac{5}{3}\\ \dfrac{x}{9}=\dfrac{15}{9}\\ x=15[/tex]

thompzac
15, because 3 goes into 9, 3 times and, 4 goes into 12, 3 times therefore x has to follow this rule because these 2 triangles are similar and because it already gives you 5 just take 5*3=15 there is your answer enjoy!=)

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