1. Represent the following signed numbers in 32-bit two's complement: (1 +12, (2). -12 2. Download Mars, the MIPS simulator, and write a MIPS program that will print the string Hello on the terminal. Make sure you run the program on the simulator and it actually works. 3. Every register stores 32-bits. Suppose now that the register s1 stores the following 32 bits: 111 where each bit is simply 1 (1). When I run the instruction add s2, s1, s3, what's the value of the number stored in s1? (2). When I run the instruction addu s2,s1,s3 instead, what's the value of the number stored in s11