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scoray [572]
3 years ago
15

No work needed!! Just answers, thank you! 25 points!!

Mathematics
1 answer:
Maurinko [17]3 years ago
3 0

Answer:

Step-by-step explanation:

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

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

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