The numeric values of the given expressions are given as follows:
1) 2.
2) -3.
How to find the numeric value of an expression?
We find the numeric value of an expression replacing all instances of x by the number.
The expression 1 is:
3 + x + (-7) = 3 + x - 7 = x - 4.
When x = 6, the value is:
x - 4 = 6 - 4 = 2.
The expression 2 is:
x + (-5) + 5 = x - 5 + 5 = x.
Hence, when x = -3, the value is:
x = -3.
More can be learned about the numeric values of the expressions at https://brainly.com/question/20930371
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