Respuesta :
Answer:
4
Step-by-step explanation:
Every year, the world grows by 1.1%. Converting to a decimal, we can divide by 100 to get 1.1% = 0.011. This means that the world grows by 0.011 exponentially each year. To put this into an expression, we can add 1 to our percentage to get 1.011. This represents 1 = 100% (the original population) and the growth of 1.1% = 0.011. We multiply the rate including the growth by the population to get the population after one year. After the first year, we have
population * 1.011 as the new population after one year. We do that for every year, so the second year's population is population*(1.011)*(1.011) and so on. If x represents the amount of years, then the population can be represented as
(original population)*1.011ˣ
Therefore, to get from 7 billion to 7.31 billion, we have
7 billion * 1.011ˣ = 7.31 billion
divide both sides by 7 billion to relatively isolate the x
1.011ˣ = 7.31/7
Another way of writing this is
log (base 1.011) (7.31/7) = x
≈ 3.96
Rounding to the nearest whole number, we get 4 as our answer
The number of years it takes for the population to grow from 7 billion to 7.31 billion is;
n = 4 years.
We are told that the population of the world grows exponentially by 1.1% per year. This is equivalent to growth of 0.011 per year exponentially.
Now, since the exponential rate is 0.011 per year, thus, if the original population is P, then after a year, the new population will be;
P_1 = 1.011¹ × P
After 2 years, it will be;
P_2 = 1.011² × P
Thus, if n represents the number of years after the initial population, then population after n years if original population is P is;
P_n = 1.011ⁿ × P
Now, we are told that the population grew from 7 billion to 7.31 billion.
Thus;
P = 7 billion
P = 7 billion P_n = 7.31 billion
Thus;
7 billion × 1.011ⁿ = 7.31 billion
divide both sides by 7 billion to get;
1.011ⁿ = 7.31/7
1.011ⁿ = 1.044285
n log 1.011 = log 1.044285
n = 0.018819/0.004751156
n ≈ 4 years
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