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Mashcka [7]
3 years ago
14

En una prueba de duración para determinar la vida útil de un nuevo tipo de lámpara lanzada al mercado, los datos de la muestra s

e distribuyeron de manera casi normal. Se calculó una vida útil
promedio de 7000 hrs. y una desviación de 520 hrs. Halla el porcentaje de lámparas que tendrán
una vida útil
a) entre la media y 7600hrs.
b)entre 6500 hrs y 7600 hrs.
c) mas de 7600
Mathematics
1 answer:
diamong [38]3 years ago
6 0

Answer:

no habla espenol :((

Step-by-step explanation:

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Y=6x-11<br> -2x-3y=-7 gnjjj
KiRa [710]

Answer:

x=2 y=1

Step-by-step explanation:

Solve the equations by substituting y=6x-11 into -2x-3y=-7.

-2x-3(6x-11)=-7

-2x-18x+33=-7

-20x+33=-7

-20x=-7-33

-20x=-40

x=2

To find y, substitute this value into the equation and solve for y.

y=6(2)-11

y=12-11

y=1

7 0
3 years ago
In the 30-60-90 triangle below, side s has a length of _ and side q has a length of _.
gregori [183]

Answer: F

Step-by-step explanation:

For a 30-60-90 triangle, we know that the hypotenuse is 2x. Since we know the hypotenuse is 10, we can solve for x.

2x=10

x=5

Now that we know x is 5, we can use this to solve for s and q. The side across from 30° is just x. Since we know x, s is 5.

The side across from 60° is x√3. Since we know what x is, we can just plug in. q is 5√3.

4 0
3 years ago
7 divided by the quantity a minus 6
Nesterboy [21]

Answer:

7 ÷ (a - 6)

Step-by-step explanation:

5 0
3 years ago
How many different ways can the line above be named? What are those names?
suter [353]
Its either 3 or 2 
the third way matches only if there's another reference  line 
I'll go with 3


7 0
3 years ago
Read 2 more answers
You have 9 medals.<br> You have 9 fewer than your friend. How<br> many medals does your friend have?
Ivan
Your friend has 18 medals.
7 0
3 years ago
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