Answer:
For example, LCM(2,3) = 6 and LCM(6,10) = 30.
 
        
                    
             
        
        
        
Sorry i don’t know the answer maybe some one else knows
        
             
        
        
        
If two numbers round to the same number it doesnt always mean they are equal, for example: 11 and 9 both round to ten but they are not the same number
        
                    
             
        
        
        
Using the Slope Equation
Pick two points on the line and determine their coordinates.
Determine the difference in y-coordinates of these two points (rise).
Determine the difference in x-coordinates for these two points (run).
Divide the difference in y-coordinates by the difference in x-coordinates (rise/run or slope).
        
             
        
        
        
Answer:
3π square units. 
Step-by-step explanation:
We can use the disk method. 
Since we are revolving around AB, we have a vertical axis of revolution. 
So, our representative rectangle will be horizontal. 
R₁ is bounded by y = 9x. 
So, x = y/9. 
Our radius since our axis is AB will be 1 - x or 1 - y/9. 
And we are integrating from y = 0 to y = 9. 
By the disk method (for a vertical axis of revolution): 
![\displaystyle V=\pi \int_a^b [R(y)]^2\, dy](https://tex.z-dn.net/?f=%5Cdisplaystyle%20V%3D%5Cpi%20%5Cint_a%5Eb%20%5BR%28y%29%5D%5E2%5C%2C%20dy)
So: 

Simplify: 

Integrate: 
![\displaystyle V=\pi\Big[y-\frac{1}{9}y^2+\frac{1}{243}y^3\Big|_0^9\Big]](https://tex.z-dn.net/?f=%5Cdisplaystyle%20V%3D%5Cpi%5CBig%5By-%5Cfrac%7B1%7D%7B9%7Dy%5E2%2B%5Cfrac%7B1%7D%7B243%7Dy%5E3%5CBig%7C_0%5E9%5CBig%5D)
Evaluate (I ignored the 0): 
![\displaystyle V=\pi[9-\frac{1}{9}(9)^2+\frac{1}{243}(9^3)]=3\pi](https://tex.z-dn.net/?f=%5Cdisplaystyle%20V%3D%5Cpi%5B9-%5Cfrac%7B1%7D%7B9%7D%289%29%5E2%2B%5Cfrac%7B1%7D%7B243%7D%289%5E3%29%5D%3D3%5Cpi)
The volume of the solid is 3π square units. 
Note: 
You can do this without calculus. Notice that R₁ revolved around AB is simply a right cone with radius 1 and height 9. Then by the volume for a cone formula: 

We acquire the exact same answer.