2 years ago

PLEASE HELP!!! asap

Mathematics

1 answer:

cricket20 [7]2 years ago

7 0

Answer:

D. (2,-1,1)

Step-by-step explanation:

Use a Desmos calculator and put in each equation. Then add a slider for Z and where all three lines intersect are your coordinates.

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What is the 9th term of the following geometric sequence? 7/9,-7/3,7,-21,63 ??????

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Given:

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$\dfrac{7}{9},\dfrac{-7}{3},7,-21,63,...$

To find:

The 9th term of the given geometric sequence.

Solution:

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Here, the first term is:

$a=\dfrac{7}{9}$

The common ratio is:

$r=\dfrac{a_2}{a_1}$

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$a_n=ar^{n-1}$

Where, a is the first term and r is the common ratio.

Substitute $a=\dfrac{7}{9},r=-3,n=9$ to find the 9th term.

$a_9=\dfrac{7}{9}(-3)^{9-1}$

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