6 subsets have 2 elements
Answer:
The answer should be -124.
ANSWER
The substitution property of equality.
EXPLANATION
We know that:

and that

Since x=5 or 5=x , we can substitute x for 5 wherever we see x in the given equation.
When we do that, we obtain;

This is what we refer to as the substitution property of equality.
427.0 mm is more precise.
feel free to ask any questions