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In spanish, there is a very big difference between those two words. Eventough they are both conectors, usually helpful to explain why someone did something or something happened, but their meaning differs...

First of all, we separate what is multiplying the X from what is not, 12x-4x>12+4 (don't forget the change of sign while passing from one side to another). Then we operatem 8x>16. Finally, x>16/2...

3x + 5y = 1   (eq 1)
2x - 3y = 7    (eq 2)

Step 1 -  2* (eq 1) 

6x + 10y = 2  (eq 3)

Step 2 - 3* (eq 2)

6x - 9y = 21  (eq 4)

The table is a cylinder so we'll need to use the equation for this shape: A = πr²h

We're looking for the thickness of the table (which is the height) so let's rearrange this equation to ...

So we know the formula for the area of a circle: πr² 

So all we need to find is the radius²

Radius = Diameter / 2 (Half the diameter)  

            = 70

R...