Find the $10\mathrm{th}$ term of the geometric series  $5+25+125+....$ Also, find its $\mathrm{nth}$ term.

Which term of the following sequences

$\sqrt{3}, 3, 3\sqrt{3}......$ is $729$?

Which term of the following sequences

$\frac{1}{3}, \frac{1}{9}, \frac{1}{27}......$ is $\frac{1}{19,683}$?

Which term of the following sequences

$-3, -27, -243......$ is $-1594323$?

Which term of the following sequences

$0.2, 0.4, 0.8......$ is $204.8$?

Find the geometric series whose $5^{th}$ and $8^{th}$ terms are,$80$ and $640$ respectively.