If a = {1, 3, 5} and b = {1, 2, 3, 4, 5, 6} then aub
1) ø
2) {1,2,3,4,5,6}
3) {2,4,6}

AUB would be the second one

Step-by-step explanation:

union means all the elements of the mentioned sets, combined. However it is mandatory that you don't repeat the elements even if they are written twice

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40

the answer is c)8

step-by-step explanaction: