Question

Is the set of multiples of 4 closed under addition? Explain why or provide a counterexample if not.

A.
Yes, because the sum of any two multiples of 4 is also a multiple of 4.

B.
Yes, because the sum of any two multiples of 4 is also a multiple of 8.

C.
No, and a counterexample is –4 + (–8) = –12.

D.
No, and a counterexample is 26 + 16 = 42.

Answer 1

@NightFury

Answer 2

What Lesson and Unit is this? and is it pre-Algebra?

Answer 3

Unit 4 | Lesson 6
Lesson Assessment: Core Focus: Closure Quiz

Answer 4

please help this is timed @NightFury

Answer 5

okay

Answer 6

so do u think u know which one this is @NightFury

Answer 7

or @TwiSTedSouls

Answer 8

I think it might be B i am not completely sure.

Answer 9

ok do u know for sure @TwiSTedSouls

Answer 10

If you could, give me a couple minutes to go over this just to be positive about the answer. Is that ok?

Answer 11

yas

Answer 12

ok my test is timed i am not trying to rush but i need to know

Answer 13

Sorry internet problems, anyway the answer would most likely be a

Answer 14

i would explain but i dont type fast enough and dont want u to fail the test

Answer 15

ok thanks help with one more please

Answer 16

ok. what is it?

Answer 17

Which sets of numbers are closed under subtraction?

Choose all answers that are correct.

A.
odd natural numbers

B.
rational numbers

C.
{0, 1}

D.
{0, 1, 2}

Answer 18

@TwiSTedSouls @NightFury @micahm

Answer 19

This is I'm not sure of. I'm think A is one of them, but this question has me confused. Sorry, but this one I can't answer for sure.

Answer 20

https://answers.yahoo.com/question/index?qid...