I need help understanding the assignment. I don't understand solving the truth table output portion if that makes sense.

Practice using Logisim-evolution and build the F(n) = n 3 + 6 circuit in simulation. Refer to the Logisim-evolution Overview.

Pop Quiz: How many output bits will you need to represent f(n), if n can be any 2-bit number?

If you have correctly answered the above question, then you will be able to make a truth table outlining all possible inputs to your machine and their corresponding outputs. This will be your first step. After that, you'll be able to analyze your truth table and determine the Combinational Logic which correctly generates each output bit based on the two input bits. You will want to diagram this logic with pencil and paper. Based on that diagram, you will finally be able to design the circuit itself.