If the model is a cosine function, it is translated $6\mathrm{.}75$ units

and $6$ units

Find a function involving the cosine function that models the water depth $\backslash ($ D$($t$)\backslash )($in meters$)$ as a function of time $\backslash ($ t $\backslash )($in hours after midnight$)$ on that day.

$\backslash ($ D$($t$)=\backslash )$