Remark
First of all, we had best correct the labeling. The adjacent is the side making up the unknown angle, and the opposite is the side not making up the given angle (in this case, x)
So you have mixed up the opposite and the adjacent. You need to switch them.
Step Two (Bottom Diagram)
Sin(x) = opposite / hypotenuse
Sin(x) = 12 / 18
Sin(x) = 2/3
Sin(x) = 0.6666666666
x = sin-1(0.66666666)
x = 41.18103
Problem One (Top One)
Sin(x) = opp/hypotenuse
Sin(x) = 4/5
Sin(x) = 0.8
x = sin-1(0.8)
x = 53.13 Answer <<<<<
Answer:
--- The equation
The solution is 12 packs i.e. p = 12
Step-by-step explanation:
No options given. So, I will solve generally.
Given

per pack

Required
Determine the equation
This is calculated using:



Divide both sides by 6

A triangle can't have two right angles because there is 180° in a triangle. Each right angle is 90° so it would be impossible
What is angle A’s equation
X=10
-3 on both sides
Then -6(x+4)+3 to the other side