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3 years ago

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I am a 3-digit number. I am a even number. The sum of all my digits together is 12. In my numbers there are only two different d

igits. The order of my digits goes smallest to greatest. (Left to Right)

1 answer:

beks73 [17]3 years ago

6 0

Answer:

228

Step-by-step explanation:

228 = 3 digits

2 + 2 + 8 = 12

228 = 2 different digits (2 and 8)

2 ≤ 2 < 8

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una ventana rectangular tiene l metros de ancho y h metros de altura, con un perímetro de 6 metros y un área de 2m² ¿cuál es la

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Answer:

The formula for calculating the width of the window is

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Step-by-step explanation:

<u><em>The question in English is</em></u>

A rectangular window is l meters wide and h meters high, with a perimeter of 6 meters and an area of 2m². What is the formula for calculating the width of the window?

we know that

The perimeter of the window is equal to

$P=2(l+w)$

we have

$P=6\ m$

so

$6=2(l+w)$

simplify

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isolate the variable l

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The area of the window is equal to

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we have

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so

$2=lw$ ----> equation B

substitute equation A in equation B

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solve for w

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The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$w^2-3w+2=0$

so

$a=1\\b=-3\\c=2$

substitute in the formula

$w=\frac{-(-3)(+/-)\sqrt{-3^{2}-4(1)(2)}} {2(1)}$ ---> formula for calculating the width of the window

$w=\frac{3(+/-)\sqrt{1}} {2}$

$w=\frac{3(+/-)1} {2}$

$w=\frac{3(+)1} {2}=2\ m$

$w=\frac{3(-)1} {2}=1\ m$

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