Respuesta :

Answer:

+5

Step-by-step explanation:

Imagine (or draw) a right triangle with acute angles at the vertices (1, 1) and (5, 4).  The horizontal leg of this triangle has length (5 - 1), or 4, and the vertical leg has length (4 - 1), or 3.  Applying the Pythagorean Theorem:

(distance between these two points) = sqrt(3^2 + 4^2) = +sqrt(25) = +5

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