What a coincidence that I just did this in my math class today. A function is a relation in which no 2 different ordered pairs have the same first coordinate. They are allowed to have the same second coordinate. So the third option is correct.
We presume you want to add the two vectors.
<5, -2> + <0, 0> = ((5+0), (-2+0)> = <5, -2>
The answer is 24. To get from one term to the next, you have to find the difference. To get from 52 to 45, you minus 7. It is the same with the other terms. So 31 - 7 = 24
500 divide by 2=250
and 250*3=750
so the answer is 750
hopw it help you :)