please answer these in scientific notation

Question

6 ? 10−8 m2 − 5 ? 10−8 m2

 

3.9 ? 10−12 m2 − 1.2 ? 10−11 m2

 

5.2 ? 10−9 m2 − 3.0 ? 10−9 m2

 

2.55 ? 10−18 m2 − 1.8 ? 10−18 m2

Answer 1

I just don’t get what all these mean? Is it Physics question ?