Answer
$x+(1.2+y)$
Work Step by Step
The associative property of addition holds that $(a+b)+c=a+(b+c)$.
In this example, we can set $(a+b)+c=(x+1.2)+y$.
Therefore, $a=x$, $b=1.2$, and $c=y$, so an equivalent expression would be $a+(b+c)=x+(1.2+y)$.
