help please

1, (chapter 2.6) Assume the following register contents: $t0 = OxAAAAAAAA, $t1 = 0x12345678 a) For the register values shown above, what is the value of $12 for the following sequence of instructions? (2 points) sll $t2, Sto, 6 or $12, $12, $t1 b) For the register values shown above, what is the value of $t2 for the following sequence of instructions? (2 points) sll $12, $t0,8 andi $12, $12, -1 c) For the register values shown above, what is the value of $t2 for the following sequence of instructions? (2 points) srl $12, $t0,3 andi St2, $t2, 0xFEFE 3, (chapter 3.2) Assume 186 and 99 are signed 8 bit decimal integers stored in sign-magnitude format. Calculate 186 - 99. Is there overflow, underflow, or neither? (3 points) 4, (chapter 3.2) Assume 161 and 214 are signed 8-bit decimal integers stored in two's complement format. Calculate 161 - 214 using saturating arithmetic. The result should be written in decimal. Show your work. (3 points)