Posted by Randi on .
If the doubling time of a state's population is 42 years, how long does it take for the population to increase by a factor of 16?

Math 
bobpursley,
doublexdoublexdoublexdouble=16

Math 
Randi,
So would your doublexdoublexdoublexdouble=16
be 2 x 2 x 2 x 2= 16??? I am a liitle confused on why you used double?