Answer: 
Step-by-step explanation:
To solve this problem you must:
1. Write the lenghts given in the problem in the same units.
2. Let's convert all the units to meters. Then:
537 km to m:

790 dm to m:

41 cm to m:

8 mm to m:

Now you rewrite them in increasing order:

Answer:
The sum of the three angles of any triangle will always be 180 degrees because when all three angles are put together, they form a straight line.
Step-by-step explanation:
I did it on Edgenuity
Solutions: x=3 , y=5 , z=2
x+y+z=10
2x-5y+2z=-15
4x+y-z=15