Question

Помогите с ответом срочно

Answer 1

$b_{1}=8\\\\b_{2}=4\\\\b_{2}=b_{1}*q\\\\q=\frac{b_{2} }{b_{1}}=\frac{4}{8}=\frac{1}{2} \\\\S=\frac{b_{1}}{1-q}=\frac{8}{1-\frac{1}{2}}=8:\frac{1}{2}=8*2=16$