Yes they do.
(x + 4) + (x + 5) = 2x + 9
x - 8 + x - 5 + x + 1 = 3x - 12
x+4x+5=5x+5
Addition is the same no matter what order it is in. If x is 2, then 2+3=5 and 3+2=5 are the same. They are all in the same fact family. Multiplication is the same no matter what order it is in as well. x times 3 is the same as 3 times x If x is 2, then 2*3=6 and 3*2=6 Fact families!
Yes.
Yes. Because the x and the 5 can change in same ways.
Yes they do.
Yes. Because the x and the 5 can change in same ways.
the order of the factors does not alter the result
When adding, the order does not matter. It's called the summation property.
5 + 5 = 10. This is the same as 5 x 2.
(x + 4) + (x + 5) = 2x + 9
Yes.
(x + 4) + (x + 5) = 2x + 9
x = 15
5+x=x+5 is an example of the commutative property of addition.