Question

What is the 9th term of the geometric sequence -1, 3, -9, ...?

Answer 1

Its geometric, therefore you are multiplying.
r = -3

Answer 2

Do you know the equations to find the answer?

Answer 3

I honestly couldn't tell you unless I googled. :P

Answer 4

\[a _{n} = a _{1} ( r ^{n-1]})\]

Answer 5

thats your equation...a1 = the first term of the sequence.
1n = the number ()in your case, 9) term you are solving for

Answer 6

an*

Answer 7

follow?

Answer 8

So, if n = 9 and r = -3 and A1 = -1 , what's your answer?