`x(x,t)=(0.8)/([(4x+5t)^(2)+5])`, represents a moving pulse where x and y are in metre and t is in second. Find
(i) The direction of wave propagation.
(ii) The wave speed.
(iii) The maximum displacement from the mean position (i.e., the aplitude of the wave).
(iv). Whether the wave pulse is symmetric or not.