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Goshia [24]
3 years ago
14

Solve the equation.

Mathematics
1 answer:
Dafna1 [17]3 years ago
6 0

Hi there!

<u>Here are all the steps into solving this equation :</u>

\frac{9z+4}{5} <u>- 8</u> = 5.4

Add 8 on each side of the equation → 5.4 + 8 = 13.4

\frac{9z+4}{5} = 13.4

Multiply each side of the equation by 5 → 13.4 × 5 = 67

9z <u>+ 4</u> = 67

Subtract 4 from each side of the equation → 67 - 4 = 63

<u>9</u>z = 63

Divide each side of the equation by 9 → 63 ÷ 9 = 7

z = 7


There you go! I really hope this helped, if there's anything just let me know! :)

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Answer:

En 5 horas se habrá enterado todo el pueblo.

Step-by-step explanation:

Sabemos que en un pueblo 5 personas escucharon una noticia.

Una hora más tarde, cada una de ellas le contó la noticia a otras 5.

Luego, éstas contaron la noticia a otras 5 y así sucesivamente.

Nadie cuenta ni escucha la noticia más de una vez y en ese pueblo hay un poco más de 19000 habitantes.

La ecuación a desarrollar para resolver el problema es la siguiente :

Comenzamos con 5 personas que escucharon la noticia a la ''hora 0''.

Una hora más tarde, cada una de ellas le contó a 5 personas, es decir , pasada la primera hora tendremos :

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Buscamos el valor de x que satisface la ecuación (II).

Probando y realizando las sumas encontramos que :

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El valor de x que satisface (II) es x=6.

Para hallar el número de horas nos fijamos que en (I) el valor del mayor exponente del 5 es el número 2. Para ese valor 2, el tiempo que pasó es una hora.

Entonces para nuestro x=6, el número de horas que pasaron son 5 horas (1 menos que el valor de x)

Todo el pueblo se habrá enterado en 5 horas de la noticia.

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