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katrin2010 [14]
3 years ago
5

Find S8 for the geometric series 3 + -6 + 12 + -24 +…

Mathematics
1 answer:
kirill115 [55]3 years ago
6 0
I guess you are asking to find the sum of the first 8 terms. If so, then:
Sum = a₁(1-rⁿ)/(1-r), where a₁ is the 1st term,  r=common ratio and n=number of terms:
the 1st term a₁ =3
common ratio r = - 2 (since -6/3 = - 2, and 12/-6 = - 2, etc.)

Sum = 3[(1- (-2)⁸]/(1-2) = 3(1- 256)/(1/2)
Sum = -1530

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loris [4]

Answer:

  25i

Step-by-step explanation:

Your calculator or your knowledge of powers of 5 will tell you that √625 is 25. The minus sign makes the root imaginary.

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6 0
3 years ago
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What are the values of the trigonometric ratios for this triangle?
nika2105 [10]

Answer:

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6 0
2 years ago
Pls help ASAP!! Urgent
Mama L [17]

A= 1/2Bh

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5 0
3 years ago
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Assoli18 [71]

Answer:

x > -5  in the answer


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8 0
3 years ago
Cindy has 26 nickels. She is getting rolls of nickels from the bank. She has enough money to get up to 10 rolls of nickels and e
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all integers from 1 to 10, inclusive

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