1. Determine $R_{in}$ of a non-inverting amplifier when $A_O=200000$, $R_D=10M\Omega$, $R_f=10k\Omega$, and $R_i=1k\Omega$.
    $$
    R_{in}=R_d(1+A\beta);\ \beta={R_i\over R_i+R_f}\\
    \beta={1k\Omega\over 11k\Omega}=0.0\overline{9}\\
    R_{in}=10M\Omega(1+2_E6(0.0\overline{9}))\\
    R_{in}=10M\Omega(181818)=1.\overline{81}T\Omega
    $$
    
2. Determine $R_{out}$ of a non-inverting amplifier, given the above, where $R_O=75\Omega$. 
    $$
    R_{out}={r_o\over 1+A\beta};\ \beta A=181818\\
    R_{out}\approx{75\Omega\over181818}=412\mu\Omega
    $$
    
3. Determine $A_{CL}$ of a non-inverting amplifier when $A_O=2000$, $R_f=10k\Omega$, and $R_i=1k\Omega$.
    $$
    A_{CL}\approx{1\over\beta};\beta=0.0\overline{9}\\
    A_{CL}=11
    $$
    
4. Repeat 3 where $A_O=200000$
    $$
    A_{CL}\approx{1\over\beta}\\
    A_{CL}=11
    $$