Final answer:
The expression that shows how to find the length of the diagonal is 5 units.
Step-by-step explanation:
To find the length of the diagonal of a rectangle, we can use the distance formula.
The distance formula is given by d = sqrt((x2 - x1)^2 + (y2 - y1)^2), where (x1, y1) and (x2, y2) are the coordinates of two points. In this case, we can use the coordinates A(-2, -4) and D(3, -4) to find the length of the diagonal.
Plugging the values into the distance formula, we get d = sqrt((3 - (-2))^2 + (-4 - (-4))^2), which simplifies to d = sqrt(5^2 + 0^2), and further simplifies to d = sqrt(25 + 0), and finally d = sqrt(25) = 5 units.