3 years ago

Testing to see if it workss

1 answer:

4 0

Yessssssss it workssssss.

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Tanzania [10]

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Step-by-step explanation:

Are you really asking this?

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3 years ago

JulijaS [17]

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2 years ago

Helga [31]

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I think she is correct

Step-by-step explanation:

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2 years ago

MatroZZZ [7]

$a_1=-4;\ a_2=-16;\ a_3=-64;\ a_4=-256;\ ...\\\\r=\dfrac{a_{n+1}}{a_n}\to r=\dfrac{a_2}{a_1}\to r=\dfrac{-16}{-4}=4$

The formula of the sum of a geometric sequence:

$S_n=a_1\cdot\dfrac{1-r^n}{1-r}$

We have:

$a_1=-4;\ n=6;\ r=4$

substitute:

$S_6=-4\cdot\dfrac{1-4^6}{1-4}=-4\cdot\dfrac{1-4096}{-3}=-4\cdot\dfrac{-4095}{-3}=-4\cdot1365=-5460$

Answer: C. -5460

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3 years ago

Andre45 [30]

Hello,
Please, see the attached files.
Thanks.

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3 years ago