Respuesta :

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[tex]f(x)=a\cdot b^x\\\\\text{a-the initial amount}\\\\\text{b-growth factor}[/tex]

[tex]\text{We have:}\ f(x)=620\cdot7.8^x\\\\\text{a=620; b=7.8}[/tex]

[tex]\boxed{Answer:\ B.\ 620,\ 7.8}[/tex]

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