You may write them separating the units and tens digits, and then use FOIL to add 4 easy tems. For example, let's compute
:

Answer:
1. x ≤ 400
2. x ≥ 200
3. x < 20
Step-by-step explanation:
I am pretty sure that this is right. :)
It’s 4,366,813 km that’s the suns length
Answer:
I think the answer would be 
Step-by-step explanation: