Answer:
-4
Step-by-step explanation:
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<span>ena ecuacion es [x^2 = 4x]</span>

<h2>
Explanation:</h2>
A parallelogram is a quadrilateral that has two pair of opposite sides and each pair measure the same. In order to illustrate this problem, see the figure below. Here we know some facts:
- Side AB measures x cm
- Side DC measures 4 cm
By definition, opposite sides in any parallelogram measure the same, so AB and DC are opposite, therefore:

<h2>Learn more: </h2>
Parallelogram: brainly.com/question/12524581
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Answer:
C. {(1,H), (2,H), (3,H), (4,H), (1,T), (2,T), (3,T), (4,T)}