Problem A, 4 pts. Find the machine code for the following instructions in
decimal notation (the back of the textbook book has the machine instruction
format).
add $3,$7,$9
sub $9,$10,$3
lw $3,224($10)
sw $6,20($13)
Problem B, 1 pt: Write a MIPS assembly language implementation
of the following C language instruction
A[j-i] = 3*k;
where the array A starts at address Astart, and variables
i, j, and k are registers $3, $4, and $5, respectively. You may use
registers $6, $7, and $8 for temporary values if needed.