At one instant, the electric and magnetic fields at one point of an electromagnetic wave

At one instant, the electric and magnetic fields at one point of an electromagnetic wave

are

E⃗=(230i^+300j^−50k^)V/m and B⃗=(7.7i^−7.6j^+ak^)B0

At one instant, the electric and magnetic fields at one point of an electromagnetic wave are

E⃗=(230i^+300j^−50k^)V/m and B⃗=(7.7i^−7.6j^+ak^)B0

Part C

What is the Poynting vector at this time and position? Find the x -component. 

Part D

Find the y -component

Part E

Find the z -component