17-15 Determine the capacitance value for the following frequency and $X_c$ values:
a. $X_c = 1 \text{ k}\Omega$, $f = 3.183 \text{ kHz}$.
b. $X_c = 200 \Omega$, $f = 63.66 \text{ kHz}$.
c. $X_c = 25 \text{ k}\Omega$, $f = 1.592 \text{ kHz}$.
d. $X_c = 1 \text{ M}\Omega$, $f = 100 \text{ Hz}$.