I'm sorry to hear that, that kind of sucks.
Its weird that you werent required by the new school to take electronics 1 again in their school, since the syllabuses of these two versions of that course arent similar, apparently.
a controlled source is a source that is cotrolled by some other parameter.
In our case, the conrolled source is a voltage-controlled voltage source, it produces voltage of (-200)*vin.
Once you understand that, and understand the voltage divider formula, i think you are capable of solving at least some of the questions here.