Verified answer

Ответ:

S4 = 425

Объяснение:

[tex]s = \frac{b1(1 - {q}^{n}) }{1 - q} [/tex]

[tex]s4 = \frac{5 \times (1 - {4}^{4}) }{1 - 4} = \frac{5 \times (1 - 256)}{ - 3} = \frac{5 \times ( - 255)}{ - 3} = \frac{ - 1275}{ - 3} = 425[/tex]