The foci of the hyperbola y236−x213=1\frac{y^2}{36} - \frac{x^2}{13} = 136y2−13x2=1 are at:
(±7,0)(\pm 7, 0)(±7,0)
(0,±7)(0, \pm 7)(0,±7)
(±49,0)(\pm \sqrt{49}, 0)(±49,0)
(0,±13)(0, \pm \sqrt{13})(0,±13)