Question

@mathstudent55 @amistre64 @ganeshie8 @thomaster @perl @satellite73
Which sets of numbers are closed under addition?

Choose all answers that are correct.

A.
{0, 2, 5, 8}

B.
even integers

C.
rational numbers

D.
{0}

Answer 1

pick any two same/different numbers from the given set and add
do you get a number that exists in the set ?

Answer 2

lets try option A :
A.
{0, 2, 5, 8}

2+5 = 7 which is not in the set, so this set is not closed under addition

Answer 3

similarly try other options

Answer 4

there is more than one answer

Answer 5

possible

Answer 6

@mathstudent55

Answer 7

@perl

Answer 8

hmm why are you tagging others ?

Answer 9

confused

Answer 10

closed means that if you operate on two of the numbers in a set, the result is also in that set

Answer 11

@chosenmatt

Answer 12

so obviously the first choice is wrong, since 2 + 2 = 4 , but 4 is not inside {0,2,5,8}

Answer 13

why are you tagging other people?

Answer 14

he said to tag him in chat

Answer 15

oh ok, i guess he will help you then

Answer 16

I believe c

Answer 17

hold on

Answer 18

c