Part A:
-np - 70 < 40
+70
-np < 110
-n < 110/p
Part B
4w-7k=28
-7k=28-4w
7k=4w-28
k=4/7w-4
Answer: 4x² + 12x + 9
Explanation:
Area = (2x + 3) (2x + 3) = 4x² + 6x + 6x + 9 = 4x² + 12x + 9
B is the one I would go with, multiplying everything by 3 in the equation 3 would eliminate y.