If your looking for a simplified answer, it would be

.
Hope this helps.
First you solve the brackets;
68+7 = 75
Then you add the 93;
75+93 = 168
(3,0) and (0,9)
Slope= (9-0)/(0-3)= -3
Line equals Y= -3x+9
Answer:
For a, I got √10 for the minimum value of modulus n.
To find the answer, you have to find the inverse sin of 0.52 which is 31.3