For this questions, why is the way this person (image with the question in it) get a different answer for the initial position (C) compared to me?

\fA particle travels along a straight line with a velocity 5 1- \\l di- 1_ 'It - .Ll .. (- v = (12 - 3:3) m/s, where I is in seconds. When I = 1 s. the particle is located If] m to the left of the origin. Determine the acceleration when r = 4 s. the displacement from t= U to e b *- t S 1n- In I = 10 s. and the distance the particle travels during this time period. 3 '... [at "t, l' C. 3 to 1 Hal-'0'l 'c' I c, '3 -2.l