Consider the circuit of Fig. (a) What is the total rate

Consider the circuit of Fig.
(a) What is the total rate at which electrical energy is dissipated in the 5.00-Ω and 9.00- Ω resistors?
(b) What is the power output of the 16.0-V battery?
(c) At what rate is electrical energy being converted to other forms in the 8.0-V battery?
(d) Show that the power output of the 16.0-V battery equals the overall rate of dissipation of electrical energy in the rest of the circuit.