Answer:
(-1,1).
Step-by-step explanation:
We need to calculate 
where R is the radius of convergence.
Applying LHopital rule we obtaing that the limit is 1. So 
then R = 1.
As the serie is the form 
we center the interval in 0. So the interval is (0-1,0+1) = (-1,1). We don't include the extrem values -1 and 1 because in those values the serie diverges.
Answer:
the answer of ur language i can understand is only a . so the answer of a is
a)7
18.5 would be the answer and here’s my work
No because 8 is to 5 and 10 is to 4, they aren’t connected. Or you can do 8/10= .8 and 5/4= 1.25, they are not the same
