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7nadin3 [17]
3 years ago
13

12x² + 2x² – 30x – 5

Mathematics
1 answer:
Dmitriy789 [7]3 years ago
8 0

Step-by-step explanation:

12 {x}^{2}  + 2 {x}^{2}  - 30x - 5 \\  = 14 {x}^{2}  - 30x - 5

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1- un tinaco se llena en 8 horas utilizando 4 llaves. en cuanto tiempo se llenara con 7 llaves?
svetoff [14.1K]

Answer: 4.6 horas.

Step-by-step explanation:

Podemos calcular el tiempo necesario por una llave:

si sabemos que se llena en 8 horas con 4 llaves, entonces una sola llave va a tardar 4 veces 8 horas en llenar el tinaco, es decir, una sola llave tarda:

4*8h = 32 horas

ahora, si usamos 7 llaves, el tiempo necesario va a ser un septimo de eso:

(32 h por llave)/(7 llaves) = 32/7 horas = 4.6 horas.

4 0
3 years ago
5. Use the rules for long division to divide 262 by 9. A. 29r1 B. 28 C. 30 D. 29
vfiekz [6]
Since 270=262+8, and \dfrac{270}9=30, we have

\dfrac{270}9=\dfrac{262}9+\dfrac89
\implies30-\dfrac89=\dfrac{262}9
\implies29+\dfrac19=\dfrac{262}9

so the answer is A.

6 0
3 years ago
In 2015, the population of the United States was about 320 million people. About 7 out of 10 Americans live in urban areas. How
Kay [80]
224million is the correct answer.
7/10 of 320,000,000 is 224,000,000
7 0
2 years ago
The ratio of girls to boys in a class is 4:3. If the total number of students in the class are 28. How many of them are girls?
Olegator [25]
4x + 3x = 28

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7x/7 = 28/7

X = 4

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4x4 = 16

16 girls
7 0
2 years ago
How do I find the ratio for this question?
faust18 [17]
The ratio for questions number 2 is C aka 3 to 5
4 0
3 years ago
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