**1. The problem statement, all variables and given/known data**

**2. Relevant equations**

**3. The attempt at a solution**

(a)We can assume for ideal op-amps that there is:

(a)

- infinite input impedance
- low output impedance
- the potential for infinite amplification

**(b)**Non-inverting op amp

**(c)**This is the part I have trouble with.

There is three resistances. The only equation we have used before for non-inverting op amps is

**V**

_{out}/

**V**

_{in}= 1 +R

_{2}/R

_{1}

**V**

_{in}= 8V

R

_{2}= 80K

I'm guessing the 6.8k resistor is part of R1 with 20k but I'm not sure how to add it....

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