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Algebra 21 Online
OpenStudy (anonymous):

Question 2 (Multiple Choice Worth 4 points) [3.01] Which of the following is a subset of the set A: {integers divisible by 2 from 2 to 20} {24, 26, 28} {4, 6, 8, 10} {integers divisible by 4 from 2 to 40} {0, 2, 4, 6 …} Question 4 (Multiple Choice Worth 5 points) [3.02] If C = {integers divisible by 2 from 1 to 12} and D = {integers divisible by 4 from 1 to 16}, what is C ∩ D? {4, 8, 12} {2, 4, 6, 8, 10, 12, 16} {8, 12} { } 3.02] If A = {1, 2, 3, 4, 5, 6, 7, 8, 9} and B = {3, 6, 9, 12, 15, 18}, what is A U B? {3, 6, 9} {1, 2, 3, 4, 5, 6, 7

OpenStudy (ivettef365):

first question asks for a subset, that is part of the set A, so which one is on set A ?

OpenStudy (ivettef365):

what integers are included on set A ??

OpenStudy (anonymous):

Which of the following is a subset of the set A: {integers divisible by 2 from 2 to 20} {24, 26, 28} {4, 6, 8, 10} {integers divisible by 4 from 2 to 40} {0, 2, 4, 6 …} You're not being clear is this second set of instructions just for {0, 2, 4, 6 …} or is this a new question?

OpenStudy (ivettef365):

that looks like part of the choices, there are 4 choices

OpenStudy (anonymous):

Which of the following is a subset of the set A: {integers divisible by 2 from 2 to 20} is the question that was given to me and these are the answers {24, 26, 28} {4, 6, 8, 10} {integers divisible by 4 from 2 to 40} {0, 2, 4, 6 …}

OpenStudy (ivettef365):

ok, @Whoknows321 what are the integers on set A ??

OpenStudy (anonymous):

I really dont know what you mean because what I posted here is all that I was given.

OpenStudy (ivettef365):

ok set A shows integers divisible by 2 from 2 - 20 so what are those integers ??

OpenStudy (anonymous):

{4, 6, 8, 10} ?

OpenStudy (anonymous):

@ivettef365 is that what you mean?

OpenStudy (amistre64):

define A by listing all the integers between 2 and 20 that are divisible by 2; this produces a set of elements to work with. A subset will not include any extra elements

OpenStudy (amistre64):

A = {2,4,6,8,10,12,14,16,18,20} from the options given, which set uses some of these elements; but nothing extra?

OpenStudy (anonymous):

so then C could be a possible answer?

OpenStudy (anonymous):

@amistre64

OpenStudy (amistre64):

well, C includes at least the number 40; since 40 is divisible by 4 .... 40 is not in the set A

OpenStudy (anonymous):

I see

OpenStudy (amistre64):

{24, 26, 28} none of these are in A {4, 6, 8, 10} these are all in A {integers divisible by 4 from 2 to 40} this uses some values that are NOT in A {0, 2, 4, 6 …} 0 is not in A, nor is "to infinity and beyond"

OpenStudy (anonymous):

thank you so much(:

OpenStudy (amistre64):

your welcome; it looks like the next problem posted deals with an "and" operation ... so consider what both the sets defined have in common with each other

OpenStudy (anonymous):

okay i will

OpenStudy (anonymous):

@amistre64 i dont understand question 5

OpenStudy (amistre64):

i dont see a question 5 ... can you post it?

OpenStudy (anonymous):

Question 5 (Multiple Choice Worth 5 points) [3.02] If A = {1, 2, 3, 4, 5, 6, 7, 8, 9} and B = {3, 6, 9, 12, 15, 18}, what is A union B? {3, 6, 9} {1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 15, 18} {1, 2, 3, 3, 4, 5, 6, 6, 7, 8, 9, 9, 12, 15, 18} { }

OpenStudy (amistre64):

when we unite sets, we just throw them into one big bowl ....

OpenStudy (amistre64):

proper set notation does not include duplication of an element either

OpenStudy (amistre64):

spose you had a bag of M&Ms and a bag of Skittles; the union of the 2 would be a bag of all the M&Ms and Skittles together so just combine the elements of each set into one big set

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