Answer
The $rms$ voltage across $R, C,$ and $L$ together is $~~75.0~V$
Work Step by Step
By the loop rule, the sum of the $rms$ voltage around the circuit is zero.
Since the $rms$ voltage of the emf is $75.0~V$, the magnitude of the $rms$ voltage across $R, C,$ and $L$ together must be $75.0~V$
