tierann46
03.11.2019 •
Mathematics
Find the 9th term of the following geometric sequence: 1, –3, 9, –27.
a. –5,661
b. 7,241
c. –2,456
d. 6,561
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Ответ:
1 times -3=-3
-3 times -3=9
an=a1(r^(n-1))
a1=first term
r=common ratio
n=which term
an=1(-3)^(n-1)
9th term
n=9
an=1(-3)^(9-1)
an=1(-3)^(8)
an=1(6561)
an=6561
answer is D
Ответ:
5 out of 10 in 10 out of 20