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pshichka [43]
2 years ago
14

The sum of four consecutive integers is at least 18. What's the smallest consecutive integer to make this statement true?

Mathematics
2 answers:
LuckyWell [14K]2 years ago
8 0

Answer:

Smallest integer is " 3 "

Step-by-step explanation:

Integers are

          3 , 4 , 5 , 6  

 3 + 4 + 5 + 6 = 18

Ghella [55]2 years ago
6 0

Let the four consecutive integers be

x , x+1, x+2, x+3

ATQ, Their sum is 18

\sf \: x + x + 1 + x + 2 + x + 3 = 18

\sf \: 4x + 1 + 2 + 3 = 18

\sf4x + 6 = 18

\sf4x = 18 - 6

\sf4x = 12

\boxed{ \mathfrak{x = 3}}

<h3>Now,</h3>

  • 1st number = x = 3
  • 2nd number = x+1 = 3+1 = 4
  • 3rd number = x+2 = 3+2 = 5
  • 4th number = x+3 = 3+3 = 6

<em>The four numbers are 3,4,5,6 respectively and the smallest number among them is 3</em><em>.</em><em>.</em><em>.</em><em>~</em>

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Answer:

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Step-by-step explanation:

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I guess it is not the intention of the problem that you prove or even know how to prove it (unless you are taking an advanced course).

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You do not need to follow with next part if you do not need to understand how to show that the cube is the shape that minimize the surface.

If you call x, y, z the three dimensions, the surface is:

S = 2xy + 2xz + 2yz (two faces xy, two faces xz and two faces yz).

Now use the Volumen formula to eliminate one variable, let's say z:

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=> S = 2xy + 2x [V/(xy)[ + 2y[V/(xy)] = 2xy + 2V/y + 2V/x

Now find dS, which needs the use of partial derivatives. It drives to:

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By the properties of the total diferentiation you have that:

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Now that you have shown that x = y.

You can rewrite the equation for S and derive it again:

S = 2xy + 2V/y + 2V/x, x = y => S = 2x^2 + 2V/x + 2V/x = 2x^2 + 4V/x

Now find S'

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Step-by-step explanation:

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