Answer:
The expression [tex]12x+15x-11x[/tex] can be combined because of the commutative property of addition.
Step-by-step explanation:
A monomial is a number, a variable or a product of a number and a variable where all exponents are whole numbers. That means that
[tex]12x+15x-11x[/tex]
all are examples of monomials.
The commutative property of addition says that changing the order of addends does not change the sum.
If we add [tex][(a + b)+ c][/tex] or [tex][a + (b + c)][/tex], the result will be same.
Therefore,
[tex]12x + 15x - 11x = (12 + 15 - 11)x\\12x + 15x - 11x = (27 - 11)x\\12x + 15x - 11x = 16x[/tex]
