Answer:
To find the volume of a composite 3D figure, draw any necessary planes to view the figure as basic three dimensional figures, then:
add basic figure volumes belonging to the composite shape.
subtract basic figure volumes NOT belonging to the composite figure.
Step-by-step explanation:
 
        
             
        
        
        
Answer:
The given system has NO SOLUTION.
Step-by-step explanation:
Here, the given system of equation is:
6 x -  2 y = 5     .......... (1)
3 x  - y = 10          .... (2)
Multiply equation 2 with (-2), we get:
3 x  - y = 10     ( x -2) 
⇒  - 6 x + 2 y = - 20 
Now, ADD this to equation (1) , we get:
 6 x - 2 y  - 6 x + 2 y  = 5 - 20
or, 0 = - 15
WHICH IS NOT POSSIBLE as 0 ≠ -15
Hence, the given system has NO SOLUTION.
 
        
             
        
        
        
This is false... you can get an easy example: (-2) + (10) = 10 - 2 = 8