Question

The set O represents the maximum temperatures, in degrees Fahrenheit, recorded in the city of Orlando in a year:

O = {71, 71, 72, 73, 77, 77, 79, 83, 84, 89, 90, 91}

The set T represents the maximum temperatures, in degrees Fahrenheit, recorded in the city of Tampa in a year:

T = {70, 72, 76, 78, 81, 81, 84, 86, 86, 89, 90, 90}

How many elements are in the set O ∪ T?

24

15

5

4

@JoannaBlackwelder

Answer 1

need explanation

Answer 2

That symbol is a union. Which means that the union is all the elements in set O and set T.

Answer 3

I mean or.

Answer 4

it is basically asking me for the common number they have right?

Answer 5

No, every single number.

Answer 6

Intersection is common numbers.

Answer 7

ooh its 15

Answer 8

forget what i just said haha feel dumb c";

Answer 9

I think it is 24.

Answer 10

Duplicates count.

Answer 11

i thought they didnt count

Answer 12

I am almost positive. Let me check.

Answer 13

ok

Answer 14

Looks like you are right. Good job. I haven't looked at these in a while.
Source: http://en.wikipedia.org/wiki/Union_%28set_theory%29

Answer 15

you don't count the duplicates when finding the union

Answer 16

thanks anyways:D got only three more i dont get this, would you help me

Answer 17

I can try :)

Answer 18

Find B union D.
B: {-2, -1, 1, 4, 7, 12}
D: {numbers divisible by 3 from 1 to 15}

{12}

{-2, -1, 1, 3, 4, 7, 12}

{-2, -1, 1, 3, 4, 6, 7, 9, 12, 15}

{ }

Answer 19

First, what is D in elements?

Answer 20

wait i got it let me read it again

Answer 21

Take your time :)

Answer 22

1,3,6,9,12,15

Answer 23

Almost. 1 isn't evenly divisible by 3.

Answer 24

im really dumb

Answer 25

hahaha sorry yeah

Answer 26

Don't worry about it. haha

Answer 27

So, now, the union is elements that are in B or D.

Answer 28

so... A?

Answer 29

That is the intersection.

Answer 30

Elements that are in B and D are elements they have in common.

Answer 31

The union is that they can be in B OR D. They don't have to be in both.

Answer 32

C!

Answer 33

of cource

Answer 34

Good job! :)

Answer 35

It is tricky at first. Don't worry. Just keep practicing and checking your answers. :)

Answer 36

I will thanks

Answer 37

now let me open a new question for my last one

Answer 38

hahaha!

Answer 39

:D