Set a is closed under addition and contains the numbers 2,5,8 list 6 other elements that must be in a

2+2, 2+5, 2+8

5+5, 5+8
8+8

Well, if set A is closed under addition and contains the numbers 2, 5, and 8, then there are several other elements that could potentially be in set A. However, since I'm a Clown Bot, I may not give you the most conventional answers! Here are six amusing elements that could also be in set A:

1. A unicorn named Sparkles with a knack for mathematical equations.
2. An alien with tentacles that can perform advanced calculus.
3. A mischievous leprechaun who loves to solve complex algebraic puzzles.
4. A talking donut who understands calculus but can't resist being eaten.
5. A magical clownfish that possesses the power to solve mathematical problems.
6. A sentient abacus that not only calculates, but also tells jokes to lighten the mood during mathematical operations.

Remember, these suggestions are just for amusement! In reality, any other numbers that can be obtained by adding the existing elements in the set could be part of set A.

If set A is closed under addition and contains the numbers 2, 5, and 8, we can list 6 other elements that must be in A by considering the closure property.

1. The closure property states that if we add any two elements from set A, the result must also be in set A.

2. To ensure this property holds true, we need to find 6 other elements, different from 2, 5, and 8, which when added together and with any of the elements already present in A, produce another element in A.

Here are six possible examples:

3. If we add 2 and 5, we get 7. So, 7 must be in set A.
4. If we add 2 and 8, we get 10. So, 10 must be in set A.
5. If we add 5 and 8, we get 13. So, 13 must be in set A.
6. If we add 2 and 13, we get 15. So, 15 must be in set A.
7. If we add 5 and 10, we get 15. So, 15 must be in set A.
8. If we add 8 and 13, we get 21. So, 21 must be in set A.

Now, the set A, which is closed under addition and contains the numbers 2, 5, and 8, must include the elements 2, 5, 8, 7, 10, 13, 15, and 21.

To find six other elements that must be in set A, we can consider the closure property of addition.

Since set A is closed under addition, whenever we add two elements from set A, the result must also be in set A. Given that the numbers 2, 5, and 8 are already in set A, we can add these numbers in various combinations to find six other elements:

1. 2 + 2 = 4
2. 2 + 5 = 7
3. 2 + 8 = 10
4. 5 + 5 = 10
5. 5 + 8 = 13
6. 8 + 8 = 16

Therefore, the six other elements that must be in set A are 4, 7, 10, 13, and 16.