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Answer 1 · 2017-06-18T09:41:32

#800,000# CDs

The #x# in the formula represents the number of the week.

We are asked to find the total number of CDs sold by the end of the third week, so all we have to do is replace #x# with #3#:

#Rightarrow "CDs sold by end of third week" = 100,000 (2^((3)))#

#Rightarrow "CDs sold by end of third week" = 100,000 (8)#

#therefore "CDs sold by end of third week" = 800,000#

Therefore, the total number of CDs sold by the end of the third week are #800,000# CDs.