How can I solve such questions? please explain step by step. Also state the answers as binary decimal and hexadecimal.

Consider the following single$-$cycle datapath

Assume that $PC=000400020$ and $$10=0$AABBCCDD,$$11=088776655,$$$12=089$ABCDEF,$$13=098765467$ and the content of instruction memory is as follow

$\backslash$table$[[$Address$,],[0\backslash$times $00400020,$SUB $$12,$$$13,$$$10],[0\backslash$times $00400024,$SUB $$11,$$$12,$$$13],[0\backslash$times $00400028,$SUB $$13,$$$10,$$$12],[0\backslash$times $0040002$C$,$SUB $$10,$$$11,$$$11]]$

A$)$ Determine the numerical values of $x1,x2,x3,x4,x5,$ and $x6.$

B$)$ Determine the value of RegDst, ALUSrc, RegWrite, and MemToReg.