3 years ago

Someone help me with this please?

Mathematics

2 answers:

MariettaO [177]3 years ago

7 0

The question's cut off. repost & ill see if i can help (:

WINSTONCH [101]3 years ago

6 0

I am sorry, but I think that the question is cut off. Perhaps you can re-post it for us to see it completely? I would be happy to help! :)

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Can someone help me with this?

Anna35 [415]

Answer:

Let 'a' be the first term, 'r' be the common ratio and 'n' be the number of terms

Series = 2+6+18.......= 2+2•3¹+ 2•3².......= 728

Now,

$Sum = \frac{a( {r}^{n} - 1) }{(r - 1)} \\$

So,

$\frac{a( {r}^{n} - 1)}{(r - 1)} = 728 \\ \frac{2( {3}^{n} - 1) }{(3 - 1)} = 728 \\ \frac{2( {3}^{n} - 1) }{2} = 728 \\ {3}^{n} - 1 = 728 \\ {3}^{n}=728+1\\ {3}^{n} = 729 \\ {3}^{n} = {3}^{6} \\ \boxed{ n = 6}$

Therefore, number of terms is 6

6 is the right answer.

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3 years ago

Which of these R-values represents the weakest correlation?

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3 years ago

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elena-14-01-66 [18.8K]

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3 years ago

What is the additive inverse of 3x - 6

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3 years ago

Ninety tickets were sold by our school for the band fest. a tickets were sold for $3.00 each and b tickets were sold for $4.00 e

Lesechka [4]

Answer: 60= $3.00 and 30= $4.00

x=# of $3 tickets

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2 years ago