how long will it take for the population of a certain country to double if its annual growth rate is 7.9%?( round to the nearest year)
solve
2 = 1(1.079)^n
you will have to know how to use logs.
take the log of both sides.
To determine how long it will take for the population of a certain country to double with an annual growth rate of 7.9%, you can use the rule of 70.
The rule of 70 states that to estimate the time it takes for a quantity to double, divide 70 by the growth rate.
In this case, the growth rate is 7.9%. To determine the time it takes for the population to double, divide 70 by 7.9:
70 / 7.9 ≈ 8.86
So, it will take approximately 8.86 years for the population of the country to double. Rounding to the nearest year, it will take approximately 9 years for the population to double.