Question

How do you multiply `(4 x 10^3)(0.2 x 10^3)` and write your answer in scientific notation?

Answer 1

Assuming the `x`'s in your question are meant to be multiplication signs (use xx to get a single multiplication sign inside hashtags)

`(4 xx 10^3)*(0.2xx 10^3)` can be re-arranged as

`(4 xx 0.2) xx (10^3 xx 10^3)`

`= 0.8 xx 10^6`