Question

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.

Answer 1

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

Answer 2

so the answer qould be 55,000?

Answer 3

Yes

Answer 4

Thanks how you find it?

Answer 5

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

Answer 6

Can you help me with another one as well ?

Answer 7

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)

Answer 8

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.

Answer 9

okay heres another question about a line graph

Answer 10

would tht be a negative number
if it goes down tht way

Answer 11

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

Answer 12

ok thanks (: