20 pointsR_(1)=12k\Omega
R_(2)=R_(3)=R_(4)=40k\Omega
V_(S)=48V
Is=1mAV_(a),V_(b), and V_(c) I_(1),I_(2), and I_(3) R_(2),R_(3), and R_(4) can be replaced with a single equivalent resistor. What is the value of this equivalent resistor? Redraw the circuit, but use your equivalent resistor to replace resistors R_(2),R_(3), and R_(4).