Which statement is true for the expression 6a + 8c − 7b + 9a?

Question

anonymous · Answer

It can be written as 6a + 9a − 7b + 8c by using distributive property of addition.
		It can be written as 6a − 7b + 8c + 9a by using distributive property of addition.
		It can be written as 6a + 9a − 7b + 8c by using commutative property of addition.
		It can be written as 6a −7b + 8c + 9a by using associative property of addition.

anonymous · Answer

commutative property of addition, 
switch places around!

anonymous · Answer

yeah i think its 3

anonymous · Answer

because 6 and 9 are both positive, but 7 is negative, so that would mean 9 would subtract 7 which adds 8 because 8 is positive...