1. How many of the instructions within our MIPS core instruction subset do NOT write a value into a result register? Which instructions are they?
2. How many of the instructions within our MIPS core instruction subset require the output of the sign extension unit? Which instructions are they?
3. How are the bits within the machine instructions for bgez (branch if greater than or equal to zero) and bltz (branch if less than zero) used to distinguish one instruction from the other?