Question

Find the 13th term of geometric sequence 7,-35,175,...

Answer 1

Answer:

$a = 7$

$r = \frac{-35}{7}$

$r = -5$

$a_{13} = 7×(-5)^{(13-1)}$

$a_{13} = 7×(-5)^{12}$

$a_{13} = 7×244,140,625$

$a_{13} = 1708984375$