The formula for an infinite geometric sequence is the following:

Just substitute the values of

and r into the formula.



Therefore, the answer is 20.
A obtuse isosceles b obtuse scalene c acute isosceles
Answer:
Step-by-step explanation:
What are you trying to ask? Do you need the notation for this? If so, the notation is:
(-∞,-3)
or
n∠-3