A circuit is constructed with six resistors and two batteries as shown. The battery voltages are V1​=18 V and V2​=12 V.

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A Circuit Is Constructed With Six Resistors And Two Batteries As Shown The Battery Voltages Are V1 18 V And V2 12 V 1 (78.11 KiB) Viewed 29 times

I can't figure out #2 and thus, can't do the rest of theproblems. Please show your work for #2-5 thank you!
A circuit is constructed with six resistors and two batteries as shown. The battery voltages are V1​=18 V and V2​=12 V. The positive terminals are indicated with a + sign, The values for the resistors are: R1​=R5​=59Ω,R2​=R6​=130ΩR3​=48Ω, and R4​=129Ω. The positive directions for the currents I1​,I2​ and I3​ are indicated by the directions of the arrows. 1) What is V4​, the magnitude of the voltage across the resistor R4​ ? 2​ 2) What is I3​, the current that flows through the resistor R3​ ? A positive value for the current is defined to be in the direction of the arrow. A 3) What is I2​, the current that flows through the resistor R2​ ? A positive value for the current is defined to be in the direction of the arrow.
4) What is I1​, the current that flows through the resistor R1​ ? A positive value for the current is defined to be in the direction of the arrow. A 5) What is V(a)−V(b), the potential difference between the points a and b ?