Question

How do you find the intersection of the two sets...
(1,3,5,9) n (5,6,1)

Answer 1

what numbers do you see common in (1,3,5,9) and (5,6,1)

Answer 2

5 and 1

Answer 3

right..so that's the intersection (1,5)

Answer 4

So the answer to this question always is just as simple as the numbers in common? theres no solving what so ever?

Answer 5

yup. no solving

Answer 6

that's the intersection

Answer 7

what if the numbers are (1,7,8) n (5,11)?

Answer 8

what are the common numbers?

Answer 9

none

Answer 10

right so the answer would be {}

Answer 11

that's a null set/empty set

Answer 12

ok so what about the questions.... find the union of the two sets (2,10,5,9) u (5,11,2)

Answer 13

then just combine them

Answer 14

combine all unique elements

Answer 15

how do you do that? im sorry lol

Answer 16

(2,10,5,9,11) like that

Answer 17

oh okay i understand

Answer 18

wonderful

Answer 19

how do you rewrite an expression without the value bars like
ll-7l-l-9ll

Answer 20

lol will your questions end =))

anyway first tell me do you know the value of |-7| and |-9|

Answer 21

no lol not at all
( im procastinating with a summer assignment and im not to good with algebra if you havnt noticed lol)

Answer 22

hint:
|5| = 5
|-5| = 5
|2| = 2
|-2| = 2

does that give you any ideas?

Answer 23

so the positive numbers = postitive numbers and negative numbers = positive numbers as well?

Answer 24

yup

Answer 25

so what would be the value of |-7| and |-9| eh?

Answer 26

7 and 9???

Answer 27

right. so what's |-7| -|-9|

Answer 28

-2???

Answer 29

correct.. so what's | |-7| - |-9| |

Answer 30

now i am a little confused, how do the bars you added at the end change the answer? or is it still -2? lol

Answer 31

|-7| - |-9| is -2 right?

Answer 32

yes

Answer 33

so | | -7| - |-9| | = |-2|

Answer 34

oh so when it asks rewrite without the absolute value bars the answer would be l l-7l - l-9l l= l-2l?

Answer 35

that's still not the answer...you have to simplify it

Answer 36

-7--9=-2?

Answer 37

what is |-2|

Answer 38

2! because all negative numbers are postivive in this problem...? right?

Answer 39

correct

Answer 40

so that's the answer

Answer 41

ok so now to put my answer down.. would i put the problem with it equal to 2 without the bars? or just the answer 2? becuase it says to rewrite without the assoloute value bars