Answers please i need them asap

Negative 5 1/12 + negative 4 1/4 + 6 3/4

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)

What is the sum of the measures of the interior angles of an octagon