In the circuit below v1 = -30 V, v2 = -30 V, v3 = 30 V, R1 = 2.8 k??, and R2 = 7.5 k??. Transform the left two practical voltage sources in the circuit below into practical current sources. Combine resistors and ideal current sources and then transform the resultant practical current source into a practical voltage source. Finally, combine the ideal voltage sources. (a) If RLRL = 7.1 k??, find the power delivered to it. (b) What is the maximum power that can be delivered to any RLRL? (c)What two different values of RLRL will have exactly 98 mW delivered to them?