Answer
$\{...,-4,-2,0,2,4,5,6,7,8,10,...\}$
Work Step by Step
We have:
$A=\{x|x$ is an even integer$\}$ = $\{...,-4,-2,0,2,4,6,8,10,...\}$ and $D=\{4,5,6,7\}$. Hence $A\cup D$ = The elements which are common in A and D, definition = $\{...,-4,-2,0,2,4,5,6,7,8,10,..\}$
