Math
posted by Emily on .
Q: Determine the sum of the first seven terms of a geometric series in which the first term is 11 and the seventh term is 704.
^Are there two answers, since the common ratio could be positive or negative?

The ratio between successive terms is
(704/11)^(1/6) = 2 (or 2)
Yes, two answers are possible.
One series would be
11, 22, 44, 88, 176, 352, 704
and the other
11, 22, 44, 88, 176, 352, 704
You do the adding