The sum expressions are -5 + a and -n + m, while the difference expressions are 7 - (-3), a - (-5) and a - (-b)
The sum expressions
The expressions are given as:
a-5
m-n
Rewrite them as follows:
-5 + a
-n + m
They can also be rewritten as:
a + (-5)
m + (-n)
The difference expressions
The expressions are given as:
7+3
a+5
a+b
Rewrite them as follows:
7 - (-3)
a - (-5)
a - (-b)
Read more about expressions at:
https://brainly.com/question/4344214
