It could be c but I’m not sure
The product of given expression is 
<em><u>Solution:</u></em>
Given that we have to find the product and write it in lowest term
Given expression is:

Let us first find common factors of numerator and denominator so, thet simplification becomes easier

Substituting these in above expression, we get

Cancel the common factors in numerator and denominator

In decimal form, we get

Thus the product of given expression is 
We know that the sum of all angle measures in a trapezoid is 360* (* means degrees)
Therefore we can construct the equation
(X+28)+(x)+(4x-14)+(4x-14)= 360
Now add like terms
10x = 360
And divide by the coefficient of X (aka 10)
X= 36