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Natasha_Volkova [10]
3 years ago
15

9,-81, 729,-6561... What is the common ratio? Help which is the correct answer?

Mathematics
1 answer:
GrogVix [38]3 years ago
7 0

Answer:

r = -9

Step-by-step explanation:

Given

Sequence: 9,-81, 729,-6561...

Required

Determine the common ratio

The common ratio r is calculated using:

r = \frac{T_n}{T_{n-1}}

Let n = 2

So, we have:

r = \frac{T_2}{T_{2-1}}

r = \frac{T_2}{T_1}

From the sequence:

T_2 = -81

T_1=9

So, the equation becomes

r = \frac{-81}{9}

r = -9

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