Answer:
13.708
Step-by-step explanation:
 
        
             
        
        
        
2, sin( θ )=6/12=1/2 => theta=30 degrees.
=> triangle is 30-60-90 
3.
Cos(45)=sqrt(2)/2
=> x=10*sqrt(2)/2=5sqrt(2)
        
             
        
        
        
The answer is 2520 degrees
        
             
        
        
        
Multiply each term in the parenthesis by -4 
-4 • 6n-4•(-5)+3a
Calculate the product -4•6n= -24n
Multiply the numbers -4•(-5)= +20
Then put every thing together 
Final Answer: -24n+20+3a
        
                    
             
        
        
        
Answer:
C
Step-by-step explanation:
3/4^2 is just 3/4 x 3/4 which is 9/16