Sry I'm couldn't solve the second one but the ans for the 1st is 504 sq units
28 = 3x+4x
x = 4
3x = 12
4x = 16
12:16 = 3:4
Although there i no triangle given as the question requires, I am still going to answer because I understand it.
ABC is a right angled triangle. The triangle is 90° at C.
The trigonometric ratio sine is given by, sine = opposite/hypotenuse .
Cosine = adjacent/hypotenuse
So therefore, Sin A = 24/30
= 4/5
Cos A = 18/30
= 3/5
The answer is C! I hope this helps
