is the value of 
![S_n=\frac{n[2a_1+(n-1)d]}{2}](/tpl/images/0532/2228/dec32.png)
, ![S_{25}=\frac{25[2(20)+(25-1)(-10)]}{2}](/tpl/images/0532/2228/94270.png)
![S_{25}=\frac{25[40+(24)(-10)]}{2}](/tpl/images/0532/2228/9927a.png)
![S_{25}=\frac{25[40-240]}{2}](/tpl/images/0532/2228/83e98.png)
![S_{25}=\frac{25[-200]}{2}](/tpl/images/0532/2228/519ed.png)
PLLLZ HELP Find Sn if a1 = 20, d = –10, and n = 25.
–2500
–2750
...
Mathematics, 03.03.2020 17:26, kellinvagneur
PLLLZ HELP Find Sn if a1 = 20, d = –10, and n = 25.
–2500
–2750
2500
–5000
Answers: 1
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