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
Another question on Mathematics
Mathematics, 21.06.2019 18:30
Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?
Answers: 1
Mathematics, 21.06.2019 19:00
Which table represents a linear function? i'll give brainliest to first answer ^'^
Answers: 1
Mathematics, 21.06.2019 20:30
Create a question with this scenario you could ask that could be answered only by graphing or using logarithm. david estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x.
Answers: 1
You know the right answer?
Questions
Computers and Technology, 14.09.2019 09:20
Computers and Technology, 14.09.2019 09:20
Chemistry, 14.09.2019 09:20
Chemistry, 14.09.2019 09:20
Chemistry, 14.09.2019 09:20
Chemistry, 14.09.2019 09:20
Chemistry, 14.09.2019 09:20
Chemistry, 14.09.2019 09:20
Chemistry, 14.09.2019 09:20
Chemistry, 14.09.2019 09:20
Chemistry, 14.09.2019 09:20
Chemistry, 14.09.2019 09:20
Chemistry, 14.09.2019 09:20
