SAT Question 72ae8a87: Nonlinear Functions answer and explanation with Desmos solution

Choice A is correct. It's given that the function $f\left(x\right)=200,000{\left(1.21\right)}^x$ gives a company's predicted annual revenue, in dollars, $x$ years after the company started selling light bulbs online. It follows that $f\left(x\right)$ represents the company's predicted annual revenue, in dollars, $x$ years after the company started selling light bulbs online. Since the value of $f\left(5\right)$ is the value of $f\left(x\right)$ when $x=5$, it follows that " $f\left(5\right)$ is approximately equal to $518,748$ " means that $f\left(x\right)$ is approximately equal to $518,748$ when $x=5$. Therefore, the best interpretation of the statement " $f\left(5\right)$ is approximately equal to $518,748$ " in this context is $5$ years after the company started selling light bulbs online, its predicted annual revenue is approximately $518,748$ dollars.