<image> In the figure, the broken line ABC represents the relationship between the phone call fee y (yuan) and the call duration t (minutes) when making a long-distance call from place A to place B.
(1) From the image, the phone call fee for a 2-minute call is ______ yuan.
(2) When t ≥ 3, find the analytical expression of the graph (write out the solving process).
(3) How much is the phone call fee for a 7-minute call?