Question

If .111... = 1/x, what is x? Correct answer will get brainliest

Answer 1

Answer:

$\sf 0.\dot{1}=\dfrac{1}{9}$

Therefore, x = 9

Step-by-step explanation:

To convert 0.11111... to a fraction:

Equation 1

Let:   y = 0.11111...

Equation 2

Multiply both sides by 10:

⇒ y · 10 = 0.11111... · 10

⇒ 10y = 1.11111...

Subtract Equation 1 from Equation 2 to eliminate the recurring digits after the decimal:

⇒ 10y - y = 1.1111... - 0.11111...

⇒ 9y = 1

Divide both sides by 9

$\implies \sf y=\dfrac{1}{9}$

Therefore,

$\sf 0.\dot{1}=\dfrac{1}{9}$

So if:

$\sf 0.\dot{1}=\dfrac{1}{x}$

Then x = 9

Answer 2

Answer:

x = 9

Step-by-step explanation:

When 1 is divided by 9, we understand it is a non-terminating decimal number because the denominator consists of other number other than 2 and 5.

Now, let's get into how to solve for x :

Divide both sides by .111... :

1/.111... x .111... = 1/.111 x 1/x

1 = 1/(x)(.111....)

Multiply both sides by x :

1(x) = (x)/(x)(.111...)

x = 1/.111...

x = 9 (nearest whole number)