What is the value of x in the isosceles trapezoid below?
a. 81 b. 15 c. 11 d. 41

The correct answer is:  [C]:  " x = 11 " .

9x + (4x + 37) = 180 ;

9x + 4x + 37 = 180 ;

13x + 37 = 180 ;

Subtract "37" from each side of the equation;

13x + 37 - 37 = 180 - 37 ;

to get:

   13x = 143 ;

Divide each side of the equation by "13" ;
 to isolate "x" on one side of the equation ; and to solve for "x" ;

    13x / 13 = 143 / 13 ;

          x = 11 ;  which is:  Answer choice:  [C] .

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!