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▹ Answer
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▹ Step-by-Step Explanation

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First one and the last one are rational. And the other two of them are irrational.
Answer:
This sequence is a geometric sequence.
The common ratio of the sequence is
3/9 = 1/3
Hope this helps
Answer:
y=-x-9
Step-by-step explanation:
y-y1=m(x-x1)
y-0=-1(x-(-9))
y=-1(x+9)
y=-x-9
12.3126 or 12.3..
How I figured this out:
https://www.mathsisfun.com/data/standard-deviation-formulas.html