Respuesta :

Answer:  3.9  (choice A)

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Work Shown:

  • a = 1
  • b = unknown
  • c = 4

Apply the pythagorean theorem to get

a^2+b^2 = c^2

1^2+b^2 = 4^2

1+b^2 = 16

b^2 = 16-1

b^2 = 15

b = sqrt(15)

b = 3.87298

b = 3.9

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