## jlongSwag27 2 years ago Can anyone help me with Union and Intersection??

1. lizki

yes,maybe i can!

2. jlongSwag27

Okay one second let me post the questions.

3. jlongSwag27

4. phi

for union A \(\cup\) B write down all the elements in A together will the elements from B. Then take out any duplicates. for intersection A \(\cap \) B look at each element in A. If that same element is in B, write it down as part of the answer. Do that for every element in A.

5. jlongSwag27

I dont even know how to do this at all.

6. phi

example: A= {1,2,3} B= {1,3,5} A ∪ B = {1,2,3,1,3,5} but take out the duplicates A ∪ B ={\( {1,2,3,\cancel{1},\cancel{3},5} \)} A ∪ B = {1,2,3,5}

7. phi

example example: A= {1,2,3} B= {1,3,5} A \(\cap\) B look at the elements in A: 1 is 1 in B? yes. Keep 1 2 is in A, is 2 in B? no 3 is in A, is 3 in B? yes keep it we get A \(\cap\) B ={1,3}

8. jlongSwag27

ok so what woulod be the answers for the questions?

9. phi

I dont even know how to do this at all. Are you saying you can't write down all the numbers in set A and all the numbers in set B?

10. jlongSwag27

wait so how would i do it

11. jlongSwag27

Question 1 (Multiple Choice Worth 2 points) Find A B. A: {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12} B: {−2, −1, 1, 4, 7, 11} {−2, −1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11} {1, 4, 7, 11} {−2, −1, 1, 2, 3, 4, 5, 6} { } -------------------------------------------------------------------------------- Question 2 (Multiple Choice Worth 2 points) 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 -------------------------------------------------------------------------------- Question 3 (Multiple Choice Worth 2 points) Find C D. C: {2, 4, 6, 8, 10, 12} D: {numbers divisible by 3 from 1 to 12} {6, 12} {2, 3, 4, 6, 8, 9, 10, 12} {3, 6, 9, 12} { } -------------------------------------------------------------------------------- Question 4 (Multiple Choice Worth 2 points) Find B 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} { } -------------------------------------------------------------------------------- Question 5 (Multiple Choice Worth 2 points) Find A B. A: {2, 4, 6, 8, 10, 12} B: {−2, −1, 2, 4, 7, 11} {2, 4} {−2, −1, 2, 4, 6, 7, 8, 10, 11, 12} {−2, −1, 1, 2, 4, 6, 8, 10} { }