Help Please!!!!! Fan and Metal!!!!!!
Using the graph below, what is the common ratio of the geometric sequence?

Question

Help Please!!!!! Fan and Metal!!!!!! 
Using the graph below, what is the common ratio of the geometric sequence?

anonymous · Answer

Where is the graph?

anonymous · Answer

anonymous · Answer

r = −20
 r = 2
 r = 10
 r equals start fraction one over two end fraction

agent0smith · Answer

We can't see the picture, you'll have to find another way to post it

anonymous · Answer

What is the sum of the first nine terms of the geometric series where a1 = 7 and r = −3?

agent0smith · Answer

Use the formula for sum of a geometric series: http://www.regentsprep.org/regents/math/algtrig/atp2/ArithG12.gif Your n is 9, a1 is 7 and r is -3. Plug them in and calculate.

anonymous · Answer

how did you get 9?

anonymous · Answer

oh the number of terms?

agent0smith · Answer

"what is the sum of the first nine terms"

anonymous · Answer

Thank you! If i need anymore help can I @ you? :)

agent0smith · Answer

Sure. I might be leaving soon though.

anonymous · Answer

aw alright well thanks for your help :)

anonymous · Answer

none of the answer choices matched the answer i got

agent0smith · Answer

Well, show your work

anonymous · Answer

|dw:1453954501999:dw|

agent0smith · Answer

It should look like 
$$\Large \frac{ 7\left(  1-(-3)^9 \right)}{ 1-(-3) }$$
Make sure you evaluate everything correctly