Which equations illustrate the commutative property of addition?

choose exactly two answers that are correct.

a.
–5 + [6 + (–4 + 3.1)] = – 5 + [(–4 + 3.1) + 6]

c.
–7.4 + (13 + 2.1) = (–7.4 + 13) + 21

d.
–9 + 11 = 11 + (–9)

10x

step-by-step explanation:

the greatest common factor 30 and 20 is 10

5 is a common factor of 30 and 20 but 10 is also a factor and 10 is greater than 5 so 5 will definitely not be apart of our answer

now the most amount of x's you factor our is just 1 factor of 1

so 10x the gcf of the terms in the polynomial