This was a timed assignment that I never got an answer on, nor was I given the correct answer once the assignment was finished. I understood Thevenin/Norton (or so I thought) until I got a Volt source that was PARALLEL to the first resistor and everything fell apart.
The question is in the picture:
The Attempt at a Solution
I am honestly stumped on this one. My textbook has no examples of a problem like this, nor did my professor give one like this in our notes. I feel like there was a curveball thrown.
I ended up getting something like 23.5 Ohms for Rth but that was from calculating the 10 Ohm and 4 Ohm resistors together as if they were in parallel. Then adding that to the 40 Ohm as if it were in series, then taking that resistance and adding it in parallel with the 52 Ohm resistor.
I'm an idiot.