6:PLEASE HELP Evaluate the expression q-v where q =28 and v=13

15

Step-by-step explanation:

q-v

             substitute values for q and v

28-13

15 is your answer. Hope this helps.

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.