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It = Total current in circuit (A)

I_2 = Current passing through second resistor (A)

I_3 = Current passing through third and fourth resistors (A)

V_Bat ≈ 6 Volts

R_1, R_2, R_3, R_4 = Resistors (ohm)

It=V_Bat*(\frac{R_2+R_3+R_4}{R_2(R_3+R_4)+R_1(R_2+R_3+R_4)})

I_2 =(\frac{V_Bat}{R_2})*(1- R_1\frac{R_2+R_3+R_4}{R_2(R_3+R_4)+R_1(R_2+R_3+R_4)})

I_3 =(\frac{V_Bat}{R_3+R_4})*(1- R_1\frac{R_2+R_3+R_4}{R_2(R_3+R_4)+R_1(R_2+R_3+R_4)})