A good answer might be:

lw $12, 0x10($13)

The original contents of $12 are irrelevant; they are replaced with the 32 bits from memory (memory remains unchanged).

Store Word Instruction

The store word instruction, sw, copies data from a register to memory. The register is not changed. The memory address is specified using a base/register pair.

sw   t,off(b)       # Word at memory address (b+off) <-- $t 
                    # b is a register. off is 16-bit two's complement.

As with the lw instruction, the memory address must be word aligned (a multiple of four).

QUESTION 8:

Conditions are as follows and memory is as at right. Write the instruction that puts the word $0xFFFFFFFF into register memory location 0x0004000C.

sw $_____ , _____($      )

Hint: it is OK to specify the 16-bit offset as a signed decimal integer.