A TV show had 3.5 × 10^6 viewers for their first episode and 8.5 × 10^6 viewers for their second episode.

How many viewers did they have overall?

To find the total number of viewers across both episodes, we need to sum the number of viewers for each episode.

Total viewers = 3.5 × 10^6 + 8.5 × 10^6
Total viewers = 12 × 10^6

Therefore, the TV show had a total of 12 million viewers overall across both episodes.