Question

Can any one help me out? Will fan and medal :)
Which sets of numbers are closed under addition?

Choose all answers that are correct.

A.
whole numbers

B.
natural numbers

C.
negative integers

D.
integers
...I think one of them is B

Answer 1

If a number set is closed under addition, then that means if you take two members of the set and add them, then the sum will also be a member of the set.

Answer 2

Here's a number family chart if that helps.

Answer 3

@Directrix thank you so much! I think I get it now, i'm going to try to solve this now :)

Answer 4

b

Answer 5

A, B, & C?

Answer 6

I don't think it involves C look at the family chart.

Answer 7

Why are you not including D, the integers? @k12_please_help

Answer 8

sorry my computer keeps freezing im no help I can barely see the question. don't listen to me.

Answer 9

@Directrix sorry I didn't realize that 0 was in the integers. So A, B, C, & D?

Answer 10

The family chart gives samples of the members of the named family.

Answer 11

That is what I am thinking. All 4 of the sets are closed under addition.

Answer 12

why the negative though?

Answer 13

Okay thank you so much! Sorry for keeping you, i'm not the best at math :p

Answer 14

The set of negative integers is the set { -1, -2, -3, -4, -5, -6, ........}.

If you pick any two of them and add them, the sum will also be a negative integer.

So, the set of negative integers is closed under addition.

Answer 15

You are welcome. No one is keeping me. I want to be here.