Question 1035108
If u is the number of Facebook users in millions, and u=.43*(3.17)^t, where t is the number of years since 2004, then:
200=.43*(3.17)^t
465.12=3.17^t
log 465.12=log 3.17^t
log 465.12=t log 3.17
t=log 465.12/log 3.17=5.32385131974 years after 2004 that the amount of Facebook users will reach 200 million. ☺☺☺☺