Simplified version: [tex] 8.1 * E^3 [/tex]
While we cannot get an exact answer to that question, we can however simplify it.
Here's how I simplified it:
Add [tex] 3.4E^2 [/tex] and [tex] 4.7E^3 [/tex] to get your answer, [tex] 8.1E^3 or 8.1 * E^3 [/tex]