Answer:
Step-by-step explanation:
[tex]a_{n}=a_{1}r^{n-1}\\0=848(0.75)^{n-1}\\or~(0.75)^{n-1}=0\\0.75<1\\so~(0.75)^{n-1} \rightarrow 0,if~n-1 \rightarrow ~\infty[/tex]
[tex]or~n \rightarrow 1+\infty\\or~n \rightarrow \infty[/tex]
Hence lake will never be free of pesticide.
