It takes Dariya 35 seconds to download 5 songs from the Internet. How can the number of seconds it would take Dariya to download 7 songs at this rate be determined?

First find the time for one song: 35 seconds ÷ 5 songs = 7 seconds per song. Then multiply the unit rate by 7 songs: 7 × 7 = 49 seconds. So the correct choice is D, finding the unit rate and multiplying it by 7.

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