conservationists tagged 80 black-nosed rabbits in a national forest in 1990. in 1991, they tagged 160 black-nosed rabbits in the same range. if the rabbit population follows the exponential law, how many rabbits will be in the range 9 years from 1990?



Answer :

The total number of rabbits in the range 9 years from​ 1990 is 4094.

Exponential growth occurs when the growth rate of the value of a mathematical function is proportional to the function’s current value, resulting in its growth with time being an exponential function. In other words, when the growth of a function increases rapidly in relation to the increase in the total number, then it is exponential.

[tex]A = A_{0} * e^{kt}[/tex] --- (1)

where A is the initial value, [tex]A_{0}[/tex] is the previous value, k is the exponential constant, and t is the time.

Now, substitute the values to determine the value of 'k'.

160 = 80 * [tex]e^{k*1}[/tex]

2 = [tex]e^{k}[/tex]

ln2 = k

k = 0.6931

Now, at t = 9 the expression (1) becomes:

[tex]A = 80 * e^{0.6931*9}[/tex]

A = 4094 rabbits

Thus, the total number of rabbits in the range 9 years from​ 1990 is 4094.

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