Can someone my sister with #3 and #4 . i tried and i can’t figure it out.

#3 Which of the following is less than 527 m?

A. 0.000699 Mm = 0.000699 · 1,000,000 m = 699 m  

B. 914,879,710 nm = (914,879,710 : 1,000,000,000) m = 0.914879710 m  

C. 51,723 cm = (51,723 : 100) m = 517.23 m  

The best answer is C

#4 How many songs would you have if the average file size is 4,000 kb?

8 gb: 1,700 songs

16 gb: 6,000 songs

2 gb: 500 songs

160 gb: 30,000 songs

64 gb: 14,000 songs

1 Terabyte = 1024 gb: so im guessing 350,000 songs

This depends on the length of the song and the file format/type. A typical mp3 song of around 4 minutes averages 4 MB (4000 KB).

She should randomly select 100 people that voted in the last election.

This will avoid bias based on age, as we would see in the second choice.  It will also ensure that the people who respond are actually voters, unlike the last choice; some people that read the newspaper may not be voters at all.  Additionally, some candidates are more popular among certain age groups, so to avoid bias we should not select just voters that voted for the most popular candidate.