Network Analysis of AC Circuit & Dependent Sources

Using mesh analysis, determine the value of Vs so that the current through 3Ω resistor is 6.76 Amp as shown in the following figure.
[IMAGE: Circuit with a 5Ω, 2Ω, 10Ω resistors, a 3A current source, 1Ω resistor and a 10A current source, with unknown source Vs.]

In the given circuit determine voltage across 1Ω resistor using mesh analysis method.
[IMAGE: Circuit with a 20V source, 4Ω, 2Ω resistors, a dependent source 2V1, a 2A current source, 3Ω and 5Ω resistors.]

Find the current in each branch of the given figure using nodal analysis.
[IMAGE: Circuit with 3Ω, 2Ω resistors, a 10V source, 4Ω resistor, a 2A current source, and dependent sources.]