SOLUTION:

Question 74007:
Found 2 solutions by jim_thompson5910, psbhowmick:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
The ratio r is the factor to get from term to term. So
r=nth term/(n-1) term

The sequence doubles each term, so the sequence is
So the 24th term is
(n=23 zero is the 1st term)
The sum of a geometric series is
where a=1

So the sum of the first ten terms is 1,023
Answer by psbhowmick(878) (Show Source): You can put this solution on YOUR website!
a) Common ratio =

b) The n-th term is given by where is the first term and is the common ratio.
Here n = 24, a = 1, r = 2.
So,

c) The sum of the first n-terms is given by .
Here n = 10, a = 1, r = 2.
So