Yea X means another number
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Yes they do.
(x + 4) + (x + 5) = 2x + 9
x+4x+5=5x+5
x - 8 + x - 5 + x + 1 = 3x - 12
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!