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Alik [6]
3 years ago
15

The length of a rectangle is four times its width. If the perimeter is at most 106 centimeters, what is the greatest possible va

lue for the width? Which inequality models this problem?
A. 2w+2 x (46) _< 106

B. 2w+ 2 x (4) _> 106

C. 2w+2 x (4w) < 106

D. 2w+2 x (46) > 106
Mathematics
2 answers:
andrezito [222]3 years ago
8 0

Answer:

Greatest possible value for the width is 10.6 centimeters.

D. 2w+2 × (46) > 106

Step-by-step explanation:

Perimeter of a rectangle = 2(l + w)

From the given question, P = 106 and l =4w

So that,

  106 = 2(4w + w)

   106 = 2(5w)

   106 = 10 w

      w = 10.6 centimeters

So, the greatest possible value for the width is 10.6 centimeters.

Model;  2w+2 × (46) > 106

      = 2 × 10.6 + 2 × (46)

       = 113.2

113.2 is greater than 106

RideAnS [48]3 years ago
5 0

Answer: A

Step-by-step explanation: The answer is w≤ 13, which means that the greatest value possible is 13.

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2 years ago
Is 1 pint eguivalent to o.473 liters
erica [24]
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3 years ago
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A certain semiconductor device requires a tunneling probability of T = 10-5 for an electron tunneling through a rectangular barr
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Answer:

Generally the barrier width is a = 1.9322 *10^{-9} \ m

Step-by-step explanation:

From the question we are told that

     The tunneling probability required is  T  = 1 * 10^{-5}

      The barrier height is  V_o  = 0.4 eV

       The electron energy is  E = 0.08eV

Generally the wave number is mathematically represented as

      k  =  \sqrt{ \frac{2 * m [V_o - E]}{\= h^2} }

Here m is the mass of the electron with the value  m  =  9.11 *10^{-31} \  kg

         h  is is know as h-bar and the value is  \= h = 1.054*10^{-34} \  J \cdot s

So

          k  =  \sqrt{ \frac{2 * 9.11 *10^{-31 } [0.4 - 0.04] * 1.6*10^{-19}}{[1.054*10^{-34}^2]} }

=>      k = 3.073582 *10^{9}  \ m^{-1}

Generally the tunneling probability is mathematically represented as

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So

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=>    6.944*10^{-6}= e^{-2 * 3.0736 *10^{9} * a}

Taking natural log of both sides

          ln[6.944*10^{-6}] = -2 * 3.0736 *10^{9} * a}

=>        -11.8776  = -2 * 3.0736 *10^{9} * a}

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