Which equation verifies that the value of x is equal to 10?

Welll......which equation, when you solve for 'x'    equals 10

 

example

 

x = 1/2 (4+7)    = 1/2 (11) = 5.5     this one does not

      and the last one does not even have 'x' in the equation...

          so it is one of the other two.....   try each and see which one results in x = 10