What property of addition is shown in the following number sentence? why?

20 × (10 + 6) = (20 × 10) + (20 × 6)

In order to answer the question, I need you to provide the number sentence in question. Could you please provide it?

No number sentence given.

opps sorry 7+(3+5)=(7+3)+5

Associative property, because the parenthesis are just moved around.

Explain why 7*8 is not a number sentence

http://www.algebra.com/algebra/homework/Distributive-associative-commutative-properties/change-this-name23395.lesson