Respuesta :

[tex]\bf A(n)=5\cdot 2^{n-1}\qquad \qquad \begin{array}{llll} 4th~term\\ 5\cdot 2^{4-1}\implies 5\cdot 2^3\implies 5\cdot 8\implies 40 \\\\\\ 8th~term\\ 5\cdot 2^{8-1}\implies 5\cdot 2^7\implies 5\cdot 128\implies 640 \end{array}[/tex]

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