Question

WILL 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

Answer 1

please help

Answer 2

an if you can explain as well..

Answer 3

when something is "closed under" it means that if you apply that operation to the set of numbers, you always get another number from that same set.

Answer 4

and you can only get a number of that set from that operation, no other ones.

Answer 5

here, this should help http://mathforum.org/library/drmath/view/52452.html

Answer 6

thanks

Answer 7

no problem ;)

Answer 8

so is it a and b and...

Answer 9

d?

Answer 10

no wait is it A, B ,C ,and D

Answer 11

I don't think it'd be D because integers include negative numbers

Answer 12

not sure about that - i'd have to check but I think integers are closed under addition

Answer 13

ya but if you add a integer with another integer it will always be an integer right?

Answer 14

yes

Answer 15

so it is closed

Answer 16

i agree

Answer 17

oh yeah, that would make sense.

Answer 18

thanks both of you so much!

Answer 19

no problem! I learned something too :)

Answer 20

cwrw238 since i cant medal 2 people, i fanned you!