SAT Question 2f34cd1c: Linear Functions answer and explanation with Desmos solution

Choice B is correct. It's given that the function $f(x)=55.20-0.16x$ gives the estimated surface water temperature, in degrees Celsius, of a body of water on the $x$th day of the year. Substituting $326$ for $x$ in the given function yields $f(326)=55.20-0.16(326)$, which is equivalent to $f(326)=55.20-52.16$, or $f(326)=3.04$. Therefore, the estimated surface water temperature, in degrees Celsius, of this body of water on the $326$th day of the year is $3.04$.