Step-by-step explanation:
The formula to determine the time it takes for a population to double in size is given by:
T = 70 / r
where T is the time in years, and r is the growth rate as a decimal.
Given a growth rate of 1.5%, we can convert it to a decimal by dividing by 100:
r = 1.5 / 100 = 0.015
Now we can use the formula to calculate the time it takes for the population to double:
T = 70 / 0.015 = 4667 years
So it would take approximately 4667 years for a population growing at 1.5% per year to double in size.