World Population #4

Question

In 2013 the membership for The Church of Jesus Christ of Latter-day Saints reached 14,780,000 members.

In 1990 the membership for The Church of Jesus Christ of Latter-day Saints was 7,300,000 members.

Letting t = 0 represent the year 2013 and assuming the church membership continues to double about every 23 years, predict church membership in year 2030.

(Round to the nearest whole number and do not use commas.)

Answer 1

14,780,000

-7,300,000

 7,480,000  <<< growth in the 23 years from 1190 to 2013 (this is where they get the  

                          "approximately double in 23 years"

 

The time between 2030 and 2013 = 17 years.

 How many parts of 23 is this time difference?

17/23 = ~ 0.73913 of a doubling period

 

y = 14,780,000(2)^17/23

     

y=24670325 church members