Hi, please help me it determines if a function or not a function. I'll mark brainliest!!!

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

The parabola opens: y=√x-4 (principal square root) up down right left

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.