Please show step by step solutions and explain. Thanks

3) Consider an LEA instruction located at x4000. What is the largest value that this instruction can load in the Destination Register? Suppose we redefine the LEA offset to be zero-extended, rather than sign-extended. then what would be the largest value that this instruction could load in the Destination Register? With the new definition, what would be the smallest value that this instruction could load in the Destination Register?

4) Write a sequence of LC-3 instructions (in bits) to set R3 equal to R4 OR R5. Assume that values have already been placed into R4 and R5 for you. You may not change the values of any other registers (only R3, R4, and R5). Include RTL or assembly comments explaining the action of each binary instruction. Hints: You MAY change R4 and R5. You should only need four instructions.