Resposta :
[tex]\large\text{$O ~valor ~de ~x ~ \Rightarrow ~ x = 6$}[/tex]
Determine o valor de x na sequência
[tex]x = \dfrac{a2 + a4}{2} \\\\\\x = \dfrac{3 + 9}{2} \\\\\\x = \dfrac{12}{2} \\\\\\x = 6[/tex]
PA = ( 0, 3, 6, 9, 12)
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