capacitors are all uncharged.

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$($a$)$ What is the total charge that has to flow through meter A for the capacitors to go from the initial uncharged state to the final state when they are fully charged?

What is the equivalent capacitance of the circuit? How is this equivalent capacitance related to the potential difference across $ab?$ mC

$($b$)$ What is the charge on each fully charged capacitor?

$Q_1$ across each capacitor in a parallel combination related? mC

$Q_2$ mC

$Q_3$ mC

$Q_4$ Ix

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$q,$ across each capacitor in a parallel combination related? mC