To find the total number of seconds the playlist will play, we need to perform the following calculations:
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Calculate the total duration in minutes by multiplying the number of songs by the average time per song:
\[ \text{Total minutes} = 1,900 \text{ songs} \times 3.5 \text{ minutes/song} \]
\[ \text{Total minutes} = 6,650 \text{ minutes} \]
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Convert minutes to seconds by multiplying the total number of minutes by 60 (since there are 60 seconds in a minute):
\[ \text{Total seconds} = 6,650 \text{ minutes} \times 60 \text{ seconds/minute} \]
\[ \text{Total seconds} = 399,000 \text{ seconds} \]
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Express the total seconds in scientific notation:
\[ 399,000 = 3.99 \times 10^5 \]
Therefore, the total number of seconds the playlist will play is \(3.99 \times 10^5\) seconds.
The correct response is:
3.99 × 10^5 seconds.