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arunamvr
27.10.2019 •
Mathematics
(98 ) can someone take a look at this? i'm stumped. (answer choices provided)
what is the fifth term of the geometric sequence?
geometric sequence represented by a graph in quadrant 1 with n on x axis and a sub n on y axis. points at (1,81), (2,9), and (3,1). (graph attached)
hint: an = a1(r)n − 1, where a1 is the first term and r is the common ratio
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Ответ:
a5 = 1/81
Step-by-step explanation:
(1,81) (2,9) (3,1)
The sequence goes
81,9,1,
We are multiplying by 1/9 each time
a1 = 81
r= 1/9
an = a1 r^(n-1)
an = 81 * (1/9) ^ (n-1)
The 5th terms
a5 = 81 * (1/9) ^ (5-1)
a5 = 81 * (1/9) ^4
a5 = 81/6561
a5 = 1/81
Ответ:
Step-by-step explanation:
(1, 81), (2, 9), (3, 1) means
a₁ = 81a₂ = 9a₃ = 1the common ratio (r) is: 9 ÷ 81 → r = 1/9
therefore,
Ответ:
0.00085714285
Step-by-step explanation:
it would take way to long to explain maybe search it up? but that is the answer