Respuesta :

Cxlver

Answer:

Step-by-step explanation:

[tex]S_{31} = 9 \cdot 31 + [-0.5 \cdot \frac{31(31-1)}{2}] = 46.5[/tex]

[tex]S_{40} = 40 + [-3 \cdot \frac{40(40-1)}{2}] = -2300[/tex]

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