I have no idea how to do this, can someone help lead me the right way? its problem number 2 on the pdf
The usual method is to find the transfer function in symbolic form, and then take the magnitude of the transfer function in symbolic form. To find the maximum, you can plot the graph to understand where the peak is. If the peak is not at zero or at infinity, then you can take the derivative with respect to frequency and set the expression to zero. That way you have the peak frequency in symbolic form. However, in this case, the answer is so simple. Look at the circuit and ask yourself what kind of filter that is.
Can I say that Vo = (Zc/Zc+R1)*Vi With Zc being the impedance of the capacitor and R1 being the 8k resistor?
Don't think so .. For instance if Zc//RL = Zp then Zp=1/(jωC+(1/RL)) You seem to have missed the inverse part, as you have Zc//RL = (jωC+(1/RL)) Remember for two parallel impedances Z1 & Z2 the effective impedance Zp is defined by 1/Zp =1/Z1 + 1/Z2 or (if you prefer) Zp=(Z1 x Z2)/(Z1+Z2)