The given expression is
3(3 * 7)
The multiplication properties include
1) Commutative property: When two numbers are multiplied together, the product is the same regardless of the order of the multiplicands.
This means that
3 * 7 = 7 * 3 = 21
3 * 21 = 63
2) associative property.: when 3 or more numbers are multiplied, the product is the same regardless of the grouping of the factors. This means that
3(3*7) = 7(3 * 3) = 3(7 * 3) = 63