Please help with MIPS questions?

The following instruction is to be assembled and converted to binary. beq $s0, $s0, target Assume that the current PC is 0x00400010 (after the increment) and the target label has the value of 0x00400040. What is the binary value of the constant in the instruction? 000 0001 0000 0000 0000 0001 0000 0000 0000 0011 0000 0000 0000 0000 1100 00 0100 0000 0000 0000 1000 0000 What is the following instruction? 0xad 100004 sw $s0, 4($t0) lw $s0, 4 ($t0) sw $t0, 4($s0) addi $s0, $t0, 4 In a r-format instruction, which bits determine the operation of the instruction? The first (upper) 6 bits The last (lower) 6 bits The last 16 bits All 32 bits