How many loops are there in this circuit? Express your answer as an integer.

For the loop picture below, v₁ = 4 V, v₂ = 2 V and v₃ = 3 V. Find v_x in Volts.

At the node picture below, i₁ = -1 A, i₂ = -2 A and i₃ = -1 A. Find i_x in Amps.

How many nodes are in this circuit? Express your answer as an integer.

In the circuit below, v_s = 0 Volts, R₁ = 9Ω, R₂ = 9Ω. Find i in Amps. Give your answer to 3 decimal places.

In the circuit below, i = 3.9 Amps, R₁ = 6.4Ω and R₂ = 3.9Ω. Find V_s in Volts to 2dp.