Answer:
Associative property.
Explanation:
We are given that
9a(bc)=(9a)bc
We have to determine that which property is illustrated by the given statement
We know that
Associative property in multiplication:
![a.(bc)=(ab).c](https://img.qammunity.org/2019/formulas/mathematics/middle-school/f0petgagi8nr97i0fkzg2iltuk038d3d5y.png)
Therefore, given statement
9a(bc)=(9a)bc
It follow associative property in multiplication.
Hence, the statement follow associative property.