Hello, My TA is currently sick and is not providing help. Can you please explain to me how to solve this problem?

Part A At one instant, the electric and magnetic fields at one point of an electromagnetic wave are E = (240i + 340 j - 60k) V/m and B = (7.9i - 7.1j + ak) Bo What is the value of a? Express your answer using two significant figures. View Available Hint(s) AEd a = Submit Part B What is the value of Bo? Express your answer using two significant figures in microteslas. View Available Hint(s) Bo Submit Part C What is the Poynting vector at this time and position? Find the r-component. Express your answer to two significant figures and include the appropriate units. View Available Hint(s) HA S, = Value w /m SubmitPart D Find the y-component of the Poynting vector. Express your answer to two significant figures and include the appropriate units. View Available Hint(s) Sy = Value W/m- Submit Part E Find the z-component of the Poynting vector. Express your answer to two significant figures and include the appropriate units. View Available Hint(s) A ? S. = Value w /m