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emmadownum
29.07.2021 •
Mathematics
Find the 8th term of the geometric sequence 7,−21,63,
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Ответ:
8th term is -15309
Step-by-step explanation:
r is the common difference, r = -21/7 = -3
Ответ:
a₈ = - 15309
Step-by-step explanation:
The nth term of a geometric sequence is
where a₁ is the first term and r the common ratio
Here a₁ = 7 and r =
=
= - 3 , then
a₈ = 7 ×
= 7 × - 2187 = - 15309
Ответ:
$2
Step-by-step explanation:
5% = 1/20
40/20 = 2