Series/parallel equivalent circuits

The connecting wires and the battery in the circuit shown below have negligible resistance.  The current (amperes) through the $$6Omega$$ resistor is most nearly:

In the figure below, what is the value ($$kOmega$$) of R needed to make $$i_1=1.25"mA"$$?

In the resistor circuit shown below, the equivalent resistance $$"R"_(eq)(Omega)$$ at Terminals a-b is most nearly:

A.   22
B.   20
C.   4
D.   2