OpenStudy (anonymous):

After one week a music downloading site sold over 80,000 songs. After 4 weeks the music downloading site sold over 300,000 songs. Find the average rate of change of songs per week.

5 years ago
OpenStudy (anonymous):

Since the original rate is 80,000, and the 4 week rate is 300,000: The rate changed by 220,000. You can divide this by 4 to get an average weekly rate. 220,000=55,000

5 years ago
OpenStudy (anonymous):

so the answer qould be 55,000?

5 years ago
OpenStudy (anonymous):

Yes

5 years ago
OpenStudy (anonymous):

Thanks how you find it?

5 years ago
OpenStudy (anonymous):

Over 4 weeks, it changed by 220,000, so you can divide by 4 to find out how much it changed on average each week

5 years ago
OpenStudy (anonymous):

Can you help me with another one as well ?

5 years ago
OpenStudy (anonymous):

i have to find if lines that pass through the given points are parallel, perpendicular or neither. Line A: (5, 4) and (7, 5) Line B: (4, -5) and (8, -3)

5 years ago
OpenStudy (anonymous):

Okay. In parallel lines, the slopes of the two lines are the same. In perpendicular lines, the slopes are opposite reciprocals (like 4/5 and -5/4) Find the slopes of the lines by finding the change in y/change in x Line A: 1/2 Line B: 2/4 1/2 and 2/4 are equal, so the lines are parallel.

5 years ago
OpenStudy (anonymous):

okay heres another question about a line graph

5 years ago
OpenStudy (anonymous):

|dw:1341346046218:dw| would tht be a negative number if it goes down tht way

5 years ago
OpenStudy (anonymous):

Yes, the slope is negative because the line's points go downwards from left to right

5 years ago
OpenStudy (anonymous):

ok thanks (:

5 years ago