It would be A. R= 50 +10m
        
             
        
        
        
Answer:
The 2nd one
Step-by-step explanation:
hope this helps!
 
        
             
        
        
        
Answer:
Let the coordinate of focus be 
As per the statement: The base of an auditorium is in the form of an eclipse 200 feet long and 100 feet wide.
⇒Length of Major axis=base of an auditorium = 200 feet and Length of a minor axis=wide of a auditorium = 100 ft
Semi-major axis (a) = 100 ft and 
semi-minor axis(b) = 50 ft
Then, by an equation:

Solve for c:
Substitute the given values we have;

Simplify:

or
 ft
 ft
Distance between the foci is,  
Therefore, the distance between the foci to the nearest 10th of a foot is, 173.2 ft
 
        
             
        
        
        
Answer:
Step-by-step explanation:
it is incorrect at step 3
it should be 12*10^(9-5)
=12*10^4
 
        
             
        
        
        
Answer:
The answer is 48
Step-by-step explanation:
x=22
2(22)+4=90