The number 2580 is shown in seven-segment digits. When the display is read in the dashed mirror, which number does it seem to show?

Reverse the order of the digits (0 8 5 2) and flip each one: 0 and 8 are unchanged, a flipped 5 looks like 2 and a flipped 2 looks like 5. So the image reads 0 8 2 5. 0852 only reverses the order; 5280 only flips the digits.