Answer:
C... 3
Step-by-step explanation:
 
        
             
        
        
        
Answer:= - sin( square root 8 over 3)sin(1/4)
Step-by-step explanation: 
So I did (square root 8/3)(square root 15/4)+sin(1/4)cos(-1/3) divide that by (-1/3)(square root 15 over 4) - sin( square root 8 over 3)sin(1/4)
 
        
             
        
        
        
Don't understand I speak English
        
             
        
        
        
The line a and line b are parallel to each other since if you draw another line or a third plane and it contains both points both in line a and in line b it means that this third plane passes through to the both lines a and b.  In order to achieve both lines a and b can be passed by the third plane, they should be parallel to each other.
        
                    
             
        
        
        
If you roll two fair dice, a green one and a red one?
A= are the outcomes on the dice independent? 
B= Find P(1 on green die and 2 on red die) 
C= Find P(2 on green die and 1 on red die) 
D= Find P(1 on green die and 2 on red die) or (2 on green die and 1 on red die)
A= yes
B= p(1)*(p2)=1/6*1/6=1/36
C= p(2)*(p1)=1/36
D= 1/36=1/18 I hope it helps !