1. The problem statement, all variables and given/known data Let z1(t) be the signal x(t) delayed by 4 sconds and then sped up by a factr of 3. Let z2(t) be the signal x(t) sped up by a factr of 3 and then delayed by 4 sconds. Do z1(t) and z2(t) represent the same signal? 2. Relevant equations 3. The attempt at a solution My answer was no they are not the same for the first part x1(t) = x(t-4) for the delay of 4 secs then sped up x2(t) = x1(3t) so y1= x(3t-4) or x(3(t-4/3) for the second part x1(t)=x(3t) sped up and x2(t) = x1(t-4) delayed by 4 secs so y2= x(3(t-4)) or x(3t-12) Is my math correct?