The domain of the following relation: R: {(−4, 8), (8, 10), (5, 4), (1, 6), (5, −9)} is

{8, 10, 4, 6, −9}

{−4, 1, 5, 8}

{−4, 8, 5, 1, 5}

No domain exists

Question

The domain of the following relation: R: {(−4, 8), (8, 10), (5, 4), (1, 6), (5, −9)} is

 {8, 10, 4, 6, −9}

 {−4, 1, 5, 8}

 {−4, 8, 5, 1, 5}

 No domain exists

kinggeorge · Answer

The domain of a relation is given by the union of the first element in all the ordered pairs. Knowing that, what do you think the answer is?

anonymous · Answer

c?

kinggeorge · Answer

Since the domain is a set, you can throw out any repeated elements. Thus, B is the correct answer.

kinggeorge · Answer

Technically, C and B are the same set, but the set in B is how you would write it.

anonymous · Answer

Can you help me with others please?

kinggeorge · Answer

Sure :)

anonymous · Answer

Thanks (:

anonymous · Answer

Which of the following does not represent the set of even integers from 2 to 14?

 {2, 4, 6, 8, 10, 12, 14}

 {2, 4, 6 …}

 {2, 4, 6 … 12, 14}

 {even integers from 2 to 14}

kinggeorge · Answer

Sorry, had to step away for a bit.  

Here, the answer would be B. This is only because the dots at the end represent an infinite set, and this clearly isn't an infinite set.