asiababbie33

21.02.2020 • 

Mathematics

Let F(x, y) be the predicate that indicates if x and y are friends, with the domain of people. Which of the following statements in predicate logic expresses the statement that

"Every pair of friends has a friend in common"?

(only one correct answer)

a.∀x ∀y [ F(x, y) → ∀z ( (y ≠ z) ∧(x ≠ z) ∧ (F(x, z) ⋁ F(y, z)) ) ]
b.∀x ∀y [ F(x, y) → ∃z ( (y ≠ z) ∧ (x ≠ z) ∧ F(x, z) ∧ F(y, z) ) ]
c.∀x ∀y [ F(x, y) → ∃z ( (y ≠ z) ∧(x ≠ z) ∧ (F(x, z) ⋁ F(y, z)) ) ]

Ответ:

anicholson41

04.12.2021

Mathematics

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Well for a rectangle, the area

A=Length x Width,
1764=Length x Width,

Since the width of the field is 13 m more than the length, the length will be equal to the with + 13, 
L=W+13,

1764=LW
1764=(W+13)(W)
W=36 meters

They want the perimeters, so add them up

2W+2L
=2(36)+2(49)
=170 meters

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