Question

I solved the first one, what about the rest

Answer 1

4.5, 45, 450, 4500. Whenever you multiply by ten, you move the decimal to the right once. 10^2 means 100 or multiply by ten twice meaning to move the decimal to the right twice. This goes on for 10^3, 10^4, etc.

Answer 2

Solved them in order

4.5
45
450
4,500