None. There are no units of measurement in this equation.
the answer to that is 5
Commutative
"8 plus 5 plus 4 equals 17."
5. Just do 9 minus 4. 5 plus 4 equals 9
19
there is no unit.
7+2+5= 14 35 42
the answer to that is 5
true
Commutative
27
"8 plus 5 plus 4 equals 17."
No.
5. Just do 9 minus 4. 5 plus 4 equals 9
false
19
yes