Between the probability of union and intersection, it's not clear what you're supposed to compute. (I would guess it's the probability of union.) But we do know that

For parts (a) and (b), you're given everything you need to determine 

.
For part (c), if 

 and 

 are mutually exclusive, then 

, so 

. If the given probability is 

, then you can find 

. But if this given probability is for the intersection, finding 

 is impossible.
For part (d), if 

 and 

 are independent, then 

.
 
        
        
        
Cause 400 divided by 10 is 40
        
             
        
        
        
The first 2 and last 2. I just did this assignment
        
                    
             
        
        
        
Answer:
(x)^2+(5)^2=(9)^2
Step-by-step explanation:
(a)^2+(b)^2=(c)^2
(x)^2+(5)^2=(9)^2
x^2+25=81
 -25 -25
x^2=56
x=28
p.s. this ^2 means squared 
 
        
             
        
        
        
Answer:
86, 593
Step-by-step explanation:
           1  1  1
       8 2 6 9 4
+        3 8 9 9
_____________
         8 6 5 9 3