Question

I'm completely lost?

Answer 1

13000-5600=7400...that's about it, just multiply then subtract

Answer 2

5.6* 10^3
5.6* (1,000)=5,600

1.3* 10^4
1.3* (10,000)=13,000
13,000-5,600=7,400
Liverpool had a greater population by 7,400 people.