Question

Jim’s music library on his phone holds 1,900 songs. The songs have an average time of 3.5 minutes. Use scientific notation to find the total number of seconds the playlist will play. Express the answer to the exact decimal place.
Responses

a. 3.99×10 to the power of 5 seconds
b. 0.399×10 to the power of 6 seconds
c. 3.99×10 to the power of 4 seconds
d. 3.99×10 to the power of 3
seconds
3.99 times 10 cubed seconds

Answer 1

1900 songs × 3.5 min/song = 6650 minutes.
6650 minutes × 60 sec/min = 399000 seconds.
In scientific notation: 3.99 × 10^5 seconds.

So the correct choice is (a).