In the circuit shown in the figure, if the source voltage is V = 28.9 Volts and the current flowing (top to bottom) through the 4000 Ω resistor is Io = 5.7 mA, find the value of the resistor R in units of Ω (Ohms). Hint: Using the voltage and current given, use KVLs, KCLs, and Ohm's Law to find voltages across and currents through all the resistors in the circuit. Once you know the voltage across and the current through the resistor R, then you can find the value of R from Ohm's Law.