please explain thoroughly how to do this, as i'm very confused

this is in MIPS

1, (chapter 2.6) Assume the following register contents: Sto = OxAAAAAAAA, Stl = 0x87654321 a) For the register values shown above, what is the value of St2 for the following sequence of instructions? (2 points) sll St2, St0,6 or St2, S12. St1 b) For the register values shown above, what is the value of St2 for the following sequence of instructions? (2 points) sll $t2, St0,8 andi $12, St2,-1 c) For the register values shown above, what is the value of St2 for the following sequence of instructions? (2 points) srl St2, $t0,3 andi St2, St2, OxFEFE