I'm sure it's a stupid question but this is my first crack at SR so help would be great. 1. The problem statement, all variables and given/known data Frame S' has a speed of 0.7c along the x axis relative to frame S. Clocks are adjusted so t=t'=0 at x=x'=0. An even occurs in S at t1 = 3 x 10^7s at x1 = 40m. At what time does the event occur in S'? 2. Relevant equations [tex]\beta = 0.7[/tex] [tex]\gamma = 1.4003[/tex] [tex]x' = \gamma (x - t\beta c)[/tex] 3. The attempt at a solution [tex]x' = \gamma (x - t\beta c) = (1.4003)(40 - (3 * 10^7)0.7 c) = -32.21m[/tex] Is this answer correct? It seems to me it can't possibly be right! What am I doing wrong?