Solve the given applied problems. (See Example.)According to data from comScore.com , two...

Solve the given applied problems. (See Example.)

According to data from comScore.com , two social media sites, Tumblr.com and Pinterest.com , acquired the same number of unique visitors in 2012. Tumblr.com took 63 months to acquire these visitors while Pinterest.com took 30 months. Pinterest’s rate of visitor growth was 450,000 more a month, on average, than Tumblr’s average growth per month.

Approximately how many unique visitors did Pinterest.com acquire in 30 months?

Example

Business Spotify and Rhapsody are digital music streaming services. In 2012, Time magazine reported that Spotify acquired in 7 business quarters (a quarter is a 3-month period) the same number of users as Rhapsody acquired in 11 years (44 quarters). Spotify’s average rate of user acquisition per quarter was 120,000 more than Rhapsody’s average rate per quarter. Find the average rate of user acquisition per quarter for each company.