Why don't you first try to use the cosine law to solve for an angle and then make use of the sin law to solve for the remaining angles. 
Cosine law 
C^2 = A^2 + B^2 - 2AB(cos C) 
Solve for cos C, and then take the inverse of the trig ratio to solve for the angle. 
Then set up a proportion like you have done using the sin law and solve for another angle. Knowing the sum of all angles in a triangle add up to 180 degrees, we can easily solve for the remaining angle.
        
             
        
        
        
Answer: 4.8 ft
To answer this question you need to know how much shadow: actual height ratio. Flagpole is having 8 ft shadow with 20 ft actual height. The ratio should be= 8 ft: 20 ft= 0.4
Then multiply the ratio with the oak tree shadow. The equation would be:
0.4 x 12 ft= 4.8 ft  
        
             
        
        
        
        
Answer:
53
Step-by-step explanation:
5+3=8, 53 flipped is 35, and 53-35=18
 
        
                    
             
        
        
        
Answer:
A
Step-by-step explanation:
FV=PV(1+i)^t
2500(1+.03)^4
A