∠DCE = ∠BAE because of alternate interior ∠s
∠CDE = ∠ABE because of alternate interior ∠s
Triangle DCE is congruent to Triangle BAE because of ASA
AE = CE because of CPCTC
BE = DE because of CPCTC
Maria first made an error in step 3.
Maria can correct her error by multiplying 136.49 by 1 over 4 before subtracting 3.0625 from it.