Mathematics, 08.07.2019 20:00 bbanfield1
What is the sum of the first 11 terms of the geometric sequence: -4, 12, -36,
Answers: 1
![S_n=\dfrac{a_1(1-r^n)}{1-r}\\\\\text{We have:}\\a_1=-4,\ r=-3,\ n=11\\\\\text{Substitute:}\\\\S_{11}=\dfrac{-4[1-(-3)^{11}]}{1-(-3)}=\dfrac{-4(1+177147)}{4}=-177148\\\\\ -177,148](/tpl/images/0066/7672/b3564.png)
Other questions on the subject: Mathematics
Mathematics, 21.06.2019 19:30, Lindsay882
How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way
Answers: 1
Mathematics, 21.06.2019 21:00, kharmaculpepper
Joanie watched 1 out of three of a movie in the morning
Answers: 1
You know the right answer?
What is the sum of the first 11 terms of the geometric sequence: -4, 12, -36,...
Questions in other subjects:
Mathematics, 14.06.2021 21:40
Mathematics, 14.06.2021 21:40
Mathematics, 14.06.2021 21:40
Chemistry, 14.06.2021 21:40
English, 14.06.2021 21:40
Mathematics, 14.06.2021 21:40
