State the property of real numbers that is being illustrated. (7⋅8)⋅4=7⋅(8⋅4)
Choose the correct answer below.

A. commutative property of multiplication
B. multiplicative inverse property
C. associative property of multiplication
D. multiplication property of zero
E. multiplicative identity

This is the Associative Property, which deals with how the factors are grouped.

The Commutative Property is about moving factors around: a•b = b•a
Multiplicative Inverse is the idea that a • 1/a = 1. (That doesn’t work for 0, btw.)
Multiplication Property of Zero says “anything times 0 is 0.”
Multiplicative Identity is the idea that multiplying by 1 doesn’t change the value: 9•1 = 9

One unique triangle, because those angles add up to 180, and that's how many degrees there are in one triangle.