The figure below shows a circuit with two batteries and three resistors. (Assume R1 = 1.20 Ģ, R2 = 4.60 Ģ, and R3 = 9.00 Ģ.)
(a) How much current flows through the 1.20-Ģ resistor?
(b) What is the potential difference between points a and b in the circuit?