Which expression is equivalent to c^2-4/c+3 / c+2/3(c^2-9)

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.

55 degrees because 55+55=110 degrees

i think the answer is a.( -3, -1 )