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andrezito [222]
3 years ago
9

A sheet of glass has a density of

Mathematics
1 answer:
Alexxandr [17]3 years ago
7 0

Answer:

2500 kg/m³

Step-by-step explanation:

Density of a material is the ratio of mass and volume of that material.

The S.I unit for density is grams per centimeters cubed (g/cm³) or kilograms per meter cubed (kg/m³)

Given density as 2.5 g/cm³ , convert to kg/m³

Formula is;

1g/cm³ = 1000 kg/m³

2.5 g/cm³=? cross-multiply

=2.5×1000 = 2500 kg/m³

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1. De una encuesta realizada a 120 personas sobre el consumo de albaricoque, banana y coco se obtuvieron el siguiente resultado.
Pachacha [2.7K]

Answer:

El número de personas que consumen dos productos es 30.

Step-by-step explanation:

El primer paso para resolver el problema es realizar los gráficos de los eventos (agregaré como archivo adjunto el gráfico del ejercicio).

En el gráfico podemos ver 7 regiones :

A : Personas que consumen sólo albaricoque.

B : Personas que consumen sólo banana.

C : Personas que consumen sólo coco.

D : Personas que consumen sólo albaricoque y coco.

E : Personas que consumen las tres frutas (albaricoque, banana y coco).

F : Personas que consumen sólo banana y coco.

G : Personas que consumen sólo albaricoque y banana.

Ahora, debemos escribir las ecuaciones que nos brinda el ejercicio :

La encuesta se realizó a 120 personas y se sabe que todas las personas consumen un producto ⇒

A+B+C+D+E+F+G=120 (I)

''El número de personas que consumen sólo albaricoque y coco es la mitad de las que consumen sólo albaricoque''  ⇒

D=\frac{A}{2} (II)

''El número de personas que consumen sólo banana es el doble de las personas que consumen sólo albaricoque y banana más sólo banana y coco'' ⇒

B=2.(G+F) (III)

Finalmente : ''El número de personas que consumen sólo coco más los que consumen los tres productos es 30''  ⇒

C+E=30 (IV)

Finalmente obtenemos el siguiente sistema de ecuaciones :

A+B+C+D+E+F+G=120\\D=\frac{A}{2}\\B=2.(G+F)\\C+E=30

El número de personas que consumen dos productos es :

D+F+G

Entonces, resolvemos escribiendo la primera ecuación conmutando los términos :

A+B+C+E+D+F+G=120 (V)

De (II) se obtiene :

2D=A (VI)

Usamos (VI), (III) y (IV) en (V) ⇒

2D+2(G+F)+30+D+F+G=120  ⇒

2D+2G+2F+30+D+F+G=120

3D+3F+3G=90

Dividiendo esta última ecuación por ''3'' obtenemos :

D+F+G=30

Que es el número de personas que consumen dos productos.

Es muy conveniente seguir el desarrollo del ejercicio mirando el gráfico que adjunto.

8 0
3 years ago
How do I go about solving sin π/4 + cos π/4
Viktor [21]
Hello Shakyiagrooms. We know:

\sin(\frac{\pi}{4}) = \frac{1}{\sqrt{2}}
AND
\cos(\frac{\pi}{4}) = \frac{1}{\sqrt{2}}

By knowing this, we can set the problem up as the following:
 \frac{1}{\sqrt{2}} + \frac{1}{\sqrt{2}}
Now we can add them since they have the same denominators:
\frac{1}{\sqrt{2}} +\frac{1}{\sqrt{2}} = \frac{2}{\sqrt{2}}
Now we have to rationalize the radical denominator \frac{2}{\sqrt{2}}. We do this by multiplying \frac{2}{\sqrt{2}} by \frac{\sqrt{2}}{\sqrt{2}}

\frac{2}{\sqrt{2}}
\frac{2}{\sqrt{2}} \times \frac{\sqrt{2}}{\sqrt{2}} = \frac{2\sqrt{2}}{\sqrt{4}}
\frac{2\sqrt{2}}{\sqrt{4}} = \frac{2\sqrt{2}}{2} = \sqrt{2}
So our answer "Drum Roll Please" =
 \sin(\frac{\pi}{4}) + \cos(\frac{\pi}{4}) = \sqrt{2}

8 0
3 years ago
12. Evaluate the function rule for the given value.<br>y = 4×2* for x = -6​
morpeh [17]

Answer:

  1/16

Step-by-step explanation:

Substituting the given value of x into the equation, we get ...

  y = 4\times 2^x=4\times 2^{-6}=\dfrac{4}{2^6}=\dfrac{4}{64}=\dfrac{1}{16}

8 0
3 years ago
What is the equation of the circle with radius, r = 11 , and the center at (0, - 7)
Dimas [21]

Answer:

A

Step-by-step explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

Given (h, k) = (0, - 7) and r = 11, then

(x - 0)² + (y - (- 7))² = 11², that is

x² + (y + 7)² = 121 → A

4 0
3 years ago
Pyramid ABCDE is a square pyramid.<br><br> What is the lateral area of pyramid ABCDE ?
SpyIntel [72]

Answer:

256√3 in^2.

Step-by-step explanation:

tan 60 = lateral height of 1 face / 8

Lateral height = 8 tan 60 = 8√3

Area of 1 face = 8 * 8√3 = 64√3

Lateral Area = 4 * 64√3 = 256√3 in^2

8 0
4 years ago
Read 2 more answers
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