why the answer should be:

lw $3 [$2 + 10]

lw $4 [$1]

add [$3 + $4] = $5

sw $5, [$1]

but not:

add $t0, $2, 10

add $1, $1, $t0

why first answer is correct but the second is wrong?

3. (10 points) A complex instruction: Addm $1, $2, 10 memo memory 0 What are the equivalent memory[$2-10, CPI 7 complex instruction? MIPS instructions (assembly language) to perform the above D For MIPS instruction, loadstore CPI 2, ALUCPI 1, which CPU is better