5x8 + 7.4 - 2(5x8)(7.4)

What aspects of lines have to be diffrent

Which shows the correct lengths of side c in both scales? scale 1: 45 m; scale 2: 60 m scale 1: 60 m; scale 2: 45 m scale 1: 36 m; scale 2: 27 m scale 1: 27 m; scale 2: 36 m mark this and return save and exit

Is a positive integer raised to a negative power always positive