Question

ill reward a medal and fan you if you help me plzzz
The set O represents the minimum temperatures, in degrees Fahrenheit, recorded in the city of Orlando in a year:

O = {49, 50, 50, 55, 56, 60, 65, 65, 70, 71, 72, 72}

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

T = {52, 54, 55, 59, 59, 61, 62, 68, 68, 70, 74, 75}
How many elements are in the set O ∪ T?
a. 2
b. 5
c. 17
d. 24

Answer 1

the union of O and T will be all their elements combined with no duplicates

Answer 2

so it would be c? @RBauer4

Answer 3

Yes. Notice that the original sets have duplicates already. So really the number of elements in O is 9 and the number of elements in T is 10. And since they share 2 elements, their union has 17 elements.

Answer 4

can you help with this one also?
Find B union D.
B: {-3, -1, 3, 4, 9, 11}
D: {numbers divisible by 3 from 1 to 15}
a. {3, 9}
b. {-3, -1, 3, 4, 9, 11}
c. { }
d. {-3, -1, 3, 4, 6, 9, 11, 12, 15}
@RBauer4

Answer 5

sure

Answer 6

can you help with this one also?
Find B union D.
B: {-3, -1, 3, 4, 9, 11}
D: {numbers divisible by 3 from 1 to 15}

a. {3, 9}
b. {-3, -1, 3, 4, 9, 11}
c. { }
d. {-3, -1, 3, 4, 6, 9, 11, 12, 15}
@RBauer4

Answer 7

Lets write out the elements in D

Answer 8

3, 6, 9, 12, 15 @RBauer4

Answer 9

Sweet. So the union of B and D will be all elements in B and D, without duplicates.

Answer 10

so d? @RBauer4

Answer 11

and could you help me out with just 2 more plz? @RBauer4

Answer 12

You got it. its d. Sure, I can help you.

Answer 13

Which of the following represents the set of integers greater than zero?
a. {1, 2, 3, 4, 5}
b. {1, 2, 3, ..., 98, 99, 100}
c. {all positive numbers}
d. {1, 2, 3, 4, 5, ...}
@RBauer4

Answer 14

So. We are interested in only positive integers. What is the largest positive integer? Is it 100?

Answer 15

yes I think so @RBauer4

Answer 16

Its not 100, right? Cause there is 1000, 10000, 100000, ... and so on. But there isn't a largest integer, since we can always find a larger one.

Answer 17

so it would be c. all positive numbers? @RBauer4

Answer 18

it isn't c because numbers like 1/2, pi, and 9.5 are in that set and these numbers are not integers.

Answer 19

When we don't know what the largest element of a set is, we write ". . ." to show that the set goes on forever; that is, the set if infinite.

Answer 20

so it is d?

Answer 21

Yes. Its d. :)

Answer 22

If U = {students attending a movie} and subset M = {male students attending a movie}, what is M'?
a. {senior citizens attending a movie}
b. {male staff members at the movie}
c. {female students attending a movie}
d. None of the above

Answer 23

What does the " ' " mean? the compliment?

Answer 24

im not sure

Answer 25

Well, we need to know what the ' means in order for us to answer the question.

Answer 26

well this is what it looks like

Answer 27

Yeah. It is basically what you sent me. in your course, they didn't mention was the ' means?

Answer 28

no

Answer 29

Hmmm. We can assume what it means, but its a gamble really.

Answer 30

I think it is just a typo

Answer 31

im guessing its d. none of the above

Answer 32

I don't think its a typo. But if it was, and they really meant to write M instead of M', then the answer would be D. I think the ' might stand for the compliment. A compliment of a set would be all elements not in that set. So, if we S = { 1 , 2, 3 } and T = {1, 2}, then T' = {3}.

Answer 33

soo c?

Answer 34

Right on.

Answer 35

thank you so much. I got a 90 on my test!!!

Answer 36

Nice! Great job.