Step-by-step explanation:
sin⁴ x − sin² x
Factor:
(sin² x) (sin² x − 1)
Pythagorean identity:
(1 − cos² x) (-cos² x)
Distribute:
-cos² x + cos⁴ x
cos⁴ x − cos² x
 
        
             
        
        
        
1 and 8 are because they are alternate exterior angles
        
             
        
        
        
Answer:
Neither
Step-by-step explanation:
Parallel must have the same slope.
Perpendicular must have reciprocal slopes.
These two contain neither.
 
        
             
        
        
        
Answer:
$12 
Step-by-step explanation:
We have to do this operation: 
(16/4) x 3 = 4 x 3 = $12