a. Use this method to derive an expression for _{q}, the expected waiting
time at a M/G/1 system with a last-come, first-served (LCFS) queue discipline. Assume
infinite queue capacity. Your result should of course be the same as (4.81), the
expression for 17V, for a M/G/1 system with FCFS queue discipline.

b. Use this method to derive expressions (4.111) and (4.112) for _{qk}
in the

case of a M/M/m queueing system with nonpreemptive priorities.

c. Use the same method for deriving expression (4.113) for _{qk} in a M/M/1
system with preemptive priorities.