Music the numbers of download music singles d (in millions) from 2004 through 2009 can be modeled by
d = -1671.88 + 1282 in t
where t = 4 corresponds to 2004. find the rates of change of the number of download music singles in 2005 and 2008.

About 200.85 million per year.

Step-by-step explanation:

Given : Music The numbers of download music singles D (in millions) from 2004 through 2009 can be modeled by

,where t = 4 corresponds to 2004.

For 2005 , t= 4+1=5  (2005=2004+1)

For 2008 , t= 4+4=8  (2008=2004+4)

At t= 5,  

At t= 8 ,  

Now , the  rates of change of the number of download music singles in 2005 and 2008. would be

The rate of change of the number of download music singles in 2005 and 2008 is about 200.85 million per year.

it is b)

hope this : )

step-by-step explanation:

no not all of them.

step-by-step explanation:

some of them have a square base.