Current Attempt in Progress

A $13\mathrm{.}6-$ resistor, a $12\mathrm{.}5-F$ capacitor, and a $18\mathrm{.}5-mH$ inductor are connected in series with a $180-V$ generator. $($a$)$ At what frequency is the current a maximum? $($b$)$ What is the maximum value of the rms current? Note: The ac current and voltage are rms values and power is an average value unless indicated otherwise.

$($a$)$ Number

Units

$($b$)$ Number

Units