need help asap!

this is question 3:

4. What is hazard? What are the types of hazard? For the instructions in question 3, how many hazards may appear? How can you solve/optimize them? After solving/optimizing the hazards how long does it take to solve the instructions. Assume each stage takes 1-cycle. What is the cycle improvement after resolving/optimizing the hazards? 3+3+3+3+3 - 15 3. Compute the total execution time for a single cycle architecture. The cycle time is 5-cycles. 5 + 10 = 10 ADDI $50, $t0,50 SW $50, 8($t1) ADD $51. $50, $t2 BEQ $52, $s1, 10 [$s2 and $s1 are not equal] SUB $s3, $s2. $50 AND $54. $s3. $s3 OR $55, $56, $s7