An is halt of the trade with others nations

1. Embargo
2. Treaty
3. Tax

A) {2,4,5,11}

{(2,3),(4,7),(5,9),(11,6)}

The numbers are given in ordered pairs (x,y)

First number is x  and the second number is y

x values are : 2, 4, 5, 11

y values are : 3, 7 , 9 , 6

Domains of a function are the set of x values

so for domain  we take all the x values and we write inside the brackets { }

Domain  is {2, 4, 5, 11}