jh32412 jh32412

21-07-2021
Mathematics

contestada

Find a12 for the geometric sequence -4, -2, -1, -1/2, ...

Respuesta :

sqdancefan sqdancefan

22-07-2021

9514 1404 393

Answer:

-1/512

Step-by-step explanation:

The first term is -4, and the common ratio is -2/-4 = 1/2. Then the n-th term is ...

an = -4·(1/2)^(n-1)

and the 12th term is ...

a12 = -4(1/2)^(12 -1) = -4/2048

a12 = -1/512

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