Given the sequence 
.
Find the range of values of x for which the given sequence converges?
Calculate the value of x such that the sum of the terms is twice the first term.
Calculate the value of x for which the square of the first term is seven times the fifth term. Round the result to four decimal places.
For x = -1 obtain the sum 
of the first n terms of the given sequence?
What is the least number of terms that must be added so that the sum will differ from the sum to infinity by less than 
?
