Page 6: Q4b You need to find the charge Q by using Q=It. Then use V=W/Q.
Page 7 Q10. This is the circuit described. But it then says that the voltmeter has a resistance, so we could re-draw the circuit like this:
All you have to do now is find the share of the voltage taken by the parallel combination. You start by working out the combined resistance of the two parallel resistors and go from there.