Question

WILL GIVE MEDAL PLEASE HELP :)
Which sets of numbers are closed under subtraction?

Choose all answers that are correct.

A.
whole numbers

B.
negative integers

C.
integers

D.
rational numbers

Answer 1

@texaschic101

Answer 2

Do you know the definition of when an operation is consider closed?

Answer 3

no :/

Answer 4

Ok an example of a set that closed under addition is the set of integers
This means any two integers I take from the set of integers and add them I will still get a number in the set of integers.
examples for my example: -1+(-1)=-2<--still an integer
-1+0=-1<--still an integer
An example of a set not being closed under addition is the set of irrationals.
sqrt(2) is irrational
but sqrt(2)+(-sqrt(2))=0 and 0 is not irrational

Answer 5

So your operation is subtraction
do you know what the wholes numbers are?

Answer 6

yeah

Answer 7

can you think of example where the set is not closed under subtraction?

Answer 8

If you can think of one example, that is enough to conclude the set is not closed.

Answer 9

Think:
What happens when you take a number and minus from it a greater number?
like what is 5-7
or 0-1

Answer 10

:/

Answer 11

you can't tell me what 5-7 is?

Answer 12

2