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