What are some of risc philosophies and design goals

Question

Problem:

Question 1- List and describe each component for all MIPS instruction format.

Question 2- Why do we need the stack pointer ($sp) reg

Question 3- MIPS is a RISC microprocessor architecture. What are some of RISC philosophies and design goals ?

Question 4- Write the MIPS assembly code to multiply 0000 1010 by 2 (Hint: shift bits )

Question 5- Write the equivalent MIPS assembly code for the following C program
a = b + c + d;
e = f - a;

Step by step instructions so I can understand would be greatly appreciated!