Final answer:
The union of L and D is {-2, -1, 0, 2, 3, 6, 7}. The intersection of L and D is {2, 6}.
Step-by-step explanation:
The union of two sets, L and D, is the set that contains all the elements from both sets. To find the union of L and D, we combine all the elements without repeating them. In this case, the union of L and D is { -2, -1, 0, 2, 3, 6, 7}.
The intersection of two sets, L and D, is the set that contains all the elements that are common to both sets. To find the intersection of L and D, we identify the elements that are present in both sets. In this case, the intersection of L and D is { 2, 6}.