[tex]f(x)\text{ = }2348810240\text{ crickets (option D)}[/tex]
Explanation:
[tex]\begin{gathered} \text{The function:} \\ f(x)\text{ = 140}\times2^x \\ \text{where x = number of months} \end{gathered}[/tex][tex]\begin{gathered} x\text{ =2 years} \\ 12\text{ months = 1 year} \\ 2\text{ years = 2(12) = 24 months} \end{gathered}[/tex][tex]\begin{gathered} f(x)\text{ = 140 }\times2^{24} \\ f(x)\text{ = 140 }\times\text{ 16777216} \\ f(x)\text{ = }2.34881024\text{ }\times10^9 \\ f(x)\text{ = }2348810240\text{ crickets (option D)} \end{gathered}[/tex]