SOLUTION: Write a formula for the sequence below,then find a10 {-4,-12,-36,-108}

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Question 1179207: Write a formula for the sequence below,then find a10
{-4,-12,-36,-108}
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

Write a formula for the sequence below, then find a%5B10%5D
-4,-12,-36,-108.......
-12%2F-4=3
-36%2F-12=3=> common ratio is 3

nth term formula
a%5Bn%5D=-4%2A3%5E%28n-1%29
find a%5B10%5D
a%5B10%5D=-4%2A3%5E%2810-1%29
a%5B10%5D=-4%2A3%5E9
a%5B10%5D=-78732