The answer to your question is 64.
Choice A is correct
BC=DC
the two triangles share one angel C
the two triangles each have a right angle
so they are congruent according to Angle-Side_Side Theorem
Given:
The bases of trapezoid measuring 4 m and 12 m.
To find:
The median of the trapezoid.
Solution:
The median of the trapezoid is the average of its bases.

The bases of trapezoid measuring 4 m and 12 m. So, the median of the trapezoid is:



Therefore, the correct option is C.
Slope 1/7 ; easiest way to remember is rise over run