The population of the world is doubling every 35 a. In 1987 the total population reached 5 billion. find the projected world population for the year 2001.
USE THE EXPONENTIAL GROWTH FORMULA.
y=y_o(e)^(kt)
35a=5e^(1987t)
ln7a/1987=k
y=5e^[(ln7a/1987)(2001)]
=35.6
this is wrong, the answer is 6.6 billion
no, doubling every 35 a.
There is an a there.. and no that is not a typo because there are other questions in the textbook that read a following a number too.. I am not too sure about this eg.
Uranium-28 has a half life of 4.5x10^9 a.
Find the mass that remains from this sample afer 1000 a. Find the rate of decrease of the mass after 10000 a.
So there is an a? :S