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Andrews [41]
3 years ago
9

EZ QUESTION:

Mathematics
1 answer:
masha68 [24]3 years ago
8 0

Answer:

first 1 second one x

Step-by-step explanation:

And you are nor R-tarted

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Considere a função de oferta como sendo y= 5x - 1/2 e a função de demanda como sendo y= -7x + 47/2 , onde x é a quantidade e y é
swat32

A) Temos que igualar isso a 2,50, que é o valor de y, ou seja, o valor do preço. Façamos isso, então, na função de demanda.

y = -7x + \frac{47}{2}

Substituir.

2,50 = - 7x + \frac{47}{2}

Passar o que é x de um lado e o que é número do outro lado.

-7x  = - \frac{47}{2} + 2,50

A fração 47/2 corresponde a 23,5. É mais interessante para nós, nesse caso, utilizar o valor decimal.

-7x  = - 23,5 + 2,50

Somar logo.

-7x = -21

Podemos multiplicar por -1 para tirar os sinais negativos.

7x = 21

Passar o x dividindo

x = \frac{21}{7}

Dividir

\boxed{x = 3}

Para um preço de R$ 2,50, a quantidade demandada é de 3 unidades.



B) Basta igualar as duas formulinhas.

5x - \frac{1}{2} = -7x + \frac{47}{2}

Passar o que é x de um lado e o que é número do outro lado.

5x + 7x = \frac{47}{2} + \frac{1}{2}

Somar tudo. Como as frações têm o mesmo denominador, <u>nada de </u><u>mmc</u>! Basta somar os numeradores.

12x = \frac{48}{2}

Podemos dividir lá, olha:

12x = 24

Passar o x dividindo

x = \frac{24}{12}

Dividir

\boxed{x = 2}

O ponto de equilíbrio é o valor 2.



C) Basta, então, igualar as fórmulas da oferta e da demanda a 10.

Fórmula da oferta

10 = 5x - \frac{1}{2}

Passar o que é x de um lado e o que é número do outro lado.

5x = 10 - \frac{1}{2}

Se 1/2 = 0,5, dá pra resolver sem fazer mmc:

5x = 10 - 0,5

Subtrair

5x = 9,5

Passar dividindo

x = \frac{9,5}{5}

Dividir.

\boxed{x = 1,9}

Fórmula da demanda

10 = -7x + \frac{47}{2}

Passar o que é x de um lado e o que é número do outro lado.

-7x = \frac{47}{2} - 10

Divide 47/2, vai.

-7x = 23,5 - 10

Subtrair.

-7x = 13,5

Passar o 7 dividindo.

x = - \frac{13,5}{7}

Vamos dividir e transformar em decimal.

\boxed{x = -1,9285714285714285714285714285714}


Subtrair a oferta pela demanda.

x = 1,9 - (-1,9285714285714285714285714285714)

Subtrair.

\boxed{x = 3,8285714285714285714285714285714}

Arredondando, o preço será de R$ 3,83.

8 0
3 years ago
Sam kept track of the number of problems he was assigned for his math homework on the box plot. A number line goes from 0 to 28.
Vanyuwa [196]

Answer:

I think its A

The data is symmetric and shows that half of the assignments contained 15 problems or fewer.

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Someone please hurry and help with number 4 and 6
makkiz [27]

Answer:

4.) y= 3x-2 6) y= 4

Step-by-step explanation:

4.

m= 3 , (-2,-8)

y-(-8) = 3(x-(-2))

y+8= 3x+6

y= 3x-2

6.

m= 0 , (5,4)

y- 4= 0(x-5)

y= 4

y= 4

3 0
3 years ago
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How do u turn 13/25 into a decimal
Ulleksa [173]
Best Answer:  <span> 3/4 = 0.75
7/50 = 0.14
13/25 = 0.52
17/25 = 0.68
1/20 = 0.05
7/10 = 0.7

To get the decimal you always divide numerator by denominator. So, the process becomes:-
3/4 = 3 ÷ 4 = 0.75
7/50 = 7 ÷ 50 = 0.14
13/25 = 13 ÷ 25 = 0.52
17/25 = 17 ÷ 25 = 0.68
1/20 = 1 ÷ 20 = 0.05
7/10 = 7 ÷ 10 = 0.7 </span>
6 0
3 years ago
Read 2 more answers
The roots of 2x^{2} + 3x = 4 are α and β. Find the simplest quadratic equation which has roots <img src="https://tex.z-dn.net/?f
elena-s [515]
2x^2+3x=4\implies2x^2+3x-4=0\implies x=\dfrac{-3\pm\sqrt{41}}4

Let \alpha be the root with the positive square root and \beta the root with the negative square root. Then

\dfrac1\alpha=\dfrac4{-3+\sqrt{41}}\quad\text{and}\quad\dfrac1\beta=\dfrac4{-3-\sqrt{41}}

The simplest quadratic with these roots can be written as

\left(x-\dfrac1\alpha\right)\left(x-\dfrac1\beta\right)=x^2-\left(\dfrac1\alpha+\dfrac1\beta\right)x+\dfrac1{\alpha\beta}=x^2-\dfrac34x-\dfrac12
4 0
3 years ago
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