Answer:
AB = 21
Step-by-step explanation:
BC and DE are sides of a regular pentagon, so their lengths are equal.
5x - 4 = 2x + 11
3x = 15
x = 5
All sides are congruent, so AB = BC = 5x - 4
AB = BC = 5x - 4
AB = 5(5) - 4
AB = 25 - 4
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