Ineed figuring out the reason for the answers

d. 145*2 is 290 than the total angle is 360 then minus 290 then divide by two

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.