Answer:
The c intercept is 42
The t intercepts are: 6, -1 and 7
Step-by-step explanation:
Given

Solving (a): The c intercept
Simply set t to 0




Solving (b): The t intercept
Simply set c(t) to 0


Split

Solve for t

LongSong = 286s
LongSong = 2 * ShortSong - 126s
=>
2 * ShortSong - 126s = 286s
2 * ShortSong = 286s + 126s
2 * ShortSong = 412s
ShortSong = 206s