Social Networking In 2007, Bebo was the largest social networking site in the UK, Ir...

Social Networking In 2007, Bebo was the largest social networking site in the UK, Ireland, and New Zealand, and was the third largest social networking site in the United States. Bebo allows users to share photos with music and blogs and draw on members’ whiteboards. The percent of Bebo users in the world between ages 17 and 33 can be modeled as

a. Calculate the average rate of change of the percent of world Bebo users who are between ages 20 and 30.

b. Calculate the percentage change in the percent of world Bebo users who are between ages 20 and 30.