2 years ago

14. Find mZCDB. B С 18 7 D 47° А A

Mathematics

1 answer:

Anna [14]2 years ago

8 0

Answer:

Step-by-step explanation:

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<u>Step-by-step explanation:</u>

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Input the values above into the Sum formula:

$S_n=\dfrac{a(1-r^n)}{1-r}\\\\S_8=\dfrac{4(1-3^8)}{1-3}\\\\.\quad=\dfrac{4(1-6561)}{-2}\\\\.\quad=\dfrac{4(-6560)}{-2}\\\\.\quad=-2(-6560)\\\\.\quad=13,120$

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