Which rational expression is equivalent to 1/(x+4) + 3/(x-5)

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

Which will form a composite function?