Question

The amount of time required to download a song from Michael's computer to his music player is the same for each song he downloads. A linear model of this situation contains the values (100, 80) and (212, 169.6), where x represents the number of songs he wants to download to his music player, and y represents the total amount of time, in minutes, it will take him to download the songs. What is the rate of change in this linear model?

A. 1.6 minutes per song
B. 0.4 of a minute per song
C. 0.8 of a minute per song
D. 112 minutes per song

Answer 1

The correct answer is A. 1.6

Explanation:

1.6x50= 80 minutes per song.

1.6x106= 169.6 minutes per song.

If you don't believe me, then grab yourself a calculator, punch the #'s (above^) in, and you'll get the answer.

Hope this helped ya out! (:

Answer 2

ans is C. 0.8 of a minute per song

Explanation:

x represents the number of songs he wants to download to his music player,

and y represents the total amount of time, in minutes, it will take him to download the songs.

(100, 80) and (212, 169.6)

subtracting: he DL 212-100=112 songs in 169.6-80=89.6 minutes

so the rate of change = 89.6/112 = 0.8 minute per song