Question

(2.5 x 10^-8) (9 x 10^-10) Express your answer in scientific notation.

Answer 1

2.25 x 10^-17

I hope this helps

Answer 2

$\bf (2.5\times 10^{-8})(9\times 10^{-10})\implies (2.5\cdot 9)\times (10^{-8}\cdot 10^{-10}) \\\\\\ (22.5)\times (10^{-8-10})\implies (2.25\times 10^1)\times 10^{-18} \\\\\\ 2.25\times 10^{1-18}\implies 2.25\times 10^{-17}$