The number of users worldwide on a social networking site can be approximately by the model N=24t -144t +600 where N is the number of users in...

The number of users worldwide on a social networking site can be approximately by the model N=24t -144t +600 where N is the number of users in millions and t is the number of years after 2000. Based on the model, predict when the number of users worldwide on a social networking site will reach 1920 million