30:28 Which of the following relations are functions? i. (1,3), (3, -4).(3, 0.5), (2,1) ii. Saty+ 2=0 iti. Oi,ii ini only Oil O ii only Given the graph of ra). when does f() - 1? 1(=] - 1 when = =0 O f(2) - 1 when = = -1 Of(=) - 1 when y = -1 O f(=) - 1 when = = -1.5