Answer:
4,100
Step-by-step explanation:
1000+1000+1000+1030=4030
20+20+30=70
4030+70=4100
Answer:
Number 4: Using Pythagoras Theorem,

Number 5:

3:
It is a right triangle
4:
Not a right triangle
For the last one:

Rounded down (because the answer needs to be a whole number) is 21