Question

find the 10th term of the geometric sequence. -0.125, 0.25, -0.5, 1, -2

Answer 1

looks like
\[a_n=\frac{1}{8}\times (-1)^k(2)^{k-1}\]

Answer 2

probably could be more elegantly written

Answer 3

then replace k by 10 to get your answer

Answer 4

64