Name the property shown by each statement.
1. 8.4=4.8
2. 6.1=6
3. 9+3+20=3+9+20
4. 7+0=7
5. 13+12=12+13
6. 6×(1×9)=(6×1)×9
i have no idea what they mean by property. if you could explain what they mean by property.

Most of these problems are the commutative property:

Addition
a + b = b + a

Multiplication
a * b = b * a

and the associative property:

Addition
(a + b) + c = a + (b + c)

Multiplication
(a * b) * c = a * (b * c)

There's also the Identity property:

Addition \ Subtraction:
a + 0 = a \ a - 0 = a

Multiplication \ Division:
a * 1 = a \ a / 1 = a

The answer is d 18ft