The answer is:
C. Yes, you can use HL to prove the triangles are congruent. Since you are given that E is the midpoint of AD and BC, you know that the hypotenuses BE and EC, as well as the legs AE and ED are congruent, you can use HL to prove the triangles are congruent.
Remember that a midpoint divides a segment into to two congruent segments.
An equation is 16-9=7
9+7=16
16-7=9
16-9=7
The answer would be 250000