We are given the following sum
![(3+9)+10=22](https://img.qammunity.org/2023/formulas/mathematics/college/l6szp77bpd1ks70oiuh4j2odpbmy7w8xdy.png)
We are asked to create an equivalent addition sentence that illustrates the associative property in addition.
Recall that the associative property of addition is given by
![(a+b)+c=a+(b+c)](https://img.qammunity.org/2023/formulas/mathematics/college/vwa5pq988mrj4lwqvvlhjzwksbnd2vg1or.png)
This property states that changing the grouping of numbers yields the same sum.
This means that you can re-group the numbers as you like.
Let us apply this property to re-write the given sum as
![3+\mleft(9+10\mright)=22](https://img.qammunity.org/2023/formulas/mathematics/college/5v0v7142sftce7eb2rjpk06ayekg60vjwa.png)
Therefore, the above sum shows an equivalent addition sentence that illustrates the associative property in addition.