First, you're fucking retarded.
Second:
a) The wave is propagating in the x-direction, look at the last term on RHS: it's the unit vector in the x-direction.
b) Literally just plug in your RHS to the wave equation. You will differentiate twice in space and twice in time. Are you fucking stupid?
c) The electric and magnetic fields are related by a simple identity. Hint: The curl of the E-field is equal to the time derivative of the B-field, but you can make this even easier.
d) The Poynting vector is given by the cross product of electric and magnetic fields. Use your result from (c) and take the cross-product.
It boggles my mind how you are this stupid...just quit physics and go do finger painting, you absolute fuckwad.
