Answer:
Reference angle is  and tan
 and tan = -1
 = -1
Step-by-step explanation:
 lies in the 4th quadrant
 lies in the 4th quadrant 
and reference angle for angle in 4th quadrant is 2π - x , where x is the angle given. 
and reference angle for  is
 is  
2π- =
 = 
and tan = -tan
 = -tan  =  -1
=  -1 
Since tan is negative in 4th quadrant ,therefore value will be  negative for the given angle.
 
        
             
        
        
        
Answer:
Explanation: 
15 goes into 60, 4 times (1 fourth is equal to 25%).
15 goes into 75, 5 times (1 fifth is equal to 20%)
So 75 is one fifth more because it has a value of 15 more, and 60 is 1 fourth less than 75 because its value is more minuscule and less is more.
If you don't understand this was quite the challenge to explain. 
 
        
             
        
        
        
Answer:
 
Step-by-step explanation:
see the attached figure to better understand the problem
In the right triangle ABC
Applying the Pythagorean Theorem

substitute the given values
 
solve for BC
 
 
 
 
        
                    
             
        
        
        
Answer:
a = -2
Step-by-step explanation:
-(5a+6)=2(3a+8)
-5a -6 = 2*3a +2*8
-5a -6 = 6a +16
-5a -6a = 16+6
-11a = 22
a= -22/11
a = -2