3 years ago

Which equation best describes the sequence-7 , 1, 9, 17, ...

Mathematics

1 answer:

butalik [34]3 years ago

8 0

Answer:

B, C, and D

Step-by-step explanation: I am not sure but I do know this nswer because i took the test.

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Find the sum of the geometric sequence –3, 15, –75, 375, … when there are 8 terms

arlik [135]

First, we need to solve for the common ratio from the data given by using the equation.

a(n) = a(1) r^(n-1)
15 = -3 r^(2-1)
-5 = r
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Then, we can find the sum by the expression:

S(n) = a(1) ( 1 - r^n) / 1-r
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S(8) = -195313

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Masja [62]

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