We have got an geometric progression. We use to find any term of a geometric sequence, this equation: an=a₁ * r^(n-1) a₁= is the first term. r=is the common ratio. n=numbers of the term to find.
r=an / an-1 In this case: r=a₂/a₁=(-4.8) / 9.6=-0.5 a₁=9.6
