We have to convert a magnitud in acres to square miles.
We know that 1 square mile = 640 acres.
Then, we can use this equivalency as a factor and calculate:
[tex]2067795\text{ acre}\cdot(\frac{1mi^2}{640\text{ acre}})=\frac{2067795}{640}mi^2\approx3230.93mi^2[/tex]Answer:
The Death Valley National Monument's area is 3230.93 square miles.