Question 1194035
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x = number of years since 2000
y = population, in thousands, at year 2000+x
D = doubling time = 30 years
P = initial population in thousands = 16


y = P*(2)^(x/D)
y = 16*(2)^(x/30)
is the population growth equation


Notice if we plugged in x = 30 we get
y = 16*(2)^(x/30)
y = 16*(2)^(30/30)
y = 16*(2)^(1)
y = 16*(2)
y = 32
Showing the population is now 32,000 in the year 2030


Now let's plug in x = 60
y = 16*(2)^(x/30)
y = 16*(2)^(60/30)
y = 16*(2)^(2)
y = 16*(4)
y = 64
The population is now 64,000 in the year 2060


In other words, the population has doubled twice (aka quadrupled).
The first time for the timespan of 2000 to 2030
The second time for the timespan of 2030 to 2060
This is of course the predicted population and not what it is 100% guaranteed to be. 


Answer: 64,000
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