1. The problem statement, all variables and given/known data 8. Four wave functions are given below. Rank them in order of the magnitude of the wave speeds, from least to greatest. I. y(x,t) = 5sin(4x − 20t + 4) II. y(x,t) = 5sin(3x −12t + 5) III. y(x,t) = 5cos(4x + 24t + 6) IV. y(x,t) =14cos(2x − 8t + 3) (A) IV, II, I, III (B) IV = II, I, III (C) III, I, II, IV (D) IV, I, II=III (E) III, IV, II, I 2. Relevant equations 3. The attempt at a solution I don't know how to go about this!