The roster form of a set is the elements listed inside brackets { }.
In this case it is easy to visualize A - B directly of the Venn diagram: when you subtract from A those elements that are also in B, the result is A - B = {4, 11, 14}.
Now take into account tha (A - B)' is the complement of (A - B), this is all the elements that are not in A - B.
Being A - B = {4, 11, 14} then to show (A - B)' you just have to list all the elements that are on the figure except 4, 11 and 14.
The result, in roster form, is (A - B)' = {1, 2, 3, 5, 6, 7, 8, 9, 10, 12, 13}
Each sandwich is toasted for 2 minutes and it takes 3 seconds to flip it. The first two sandwiches will be toasted in 2 minutes (toasting) and 6 seconds (flipping). The two will then be switched which will take 10 seconds. The next two will again take 2 minutes and 6 seconds. The final sandwich will take 5 seconds to be placed. The final sandwich will also take 2 minutes to toast and 3 seconds to flip. Total time: 2 + 2 +2 = 6 minutes 6 + 10 + 6 + 3 = 25 seconds Total time is 6 minutes and 25 seconds.
To answer this question first you have to count the difference between the highest number with the lowest number. In this case, the difference is: 40-12=28
After that, you need to determine the leaps in the sequence. In this case, there are 4 leaps. After that divide the difference with the leaps : 28:4=7 Therefore the sequence will be 12 , 19, 26, 33, 40
