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malfutka [58]
3 years ago
9

Consider the following repeating decimal. 0.619

Mathematics
1 answer:
slega [8]3 years ago
6 0

Answer:

a.  0.6\overline {19} = 0.6 + \ \sum \limits ^{\infty}_{n=0} \  0.019 \ ( \dfrac{1}{100})^n

b. 0.6\overline {19}  = \mathbf{\dfrac{613}{990}}  

Step-by-step explanation:

Consider the following repeating decimal. 0.6\overline {19}

a) Write the repeating decimal as a geometric series.

0.6\overline {19} is being expressed as 0.6191919...

0.6\overline {19} = 0.6 + 0.019 + 0.00019+ 0.0000019 + ...

0.6\overline {19} =0.6 +  \dfrac{19}{1000}+ \dfrac{19}{100000}+ \dfrac{19}{10000000}+ ...

0.6\overline {19} = 0.6+ \dfrac{19}{1000} \begin {bmatrix} 1 + \dfrac{1}{100} + \dfrac{1}{10000}+ ... \end  {bmatrix}

0.6\overline {19} = 0.6 + \ \sum \limits ^{\infty}_{n=0} \  0.019 \ ( \dfrac{1}{100})^n

(b) Write the sum of the series as the ratio of two integers

0.6\overline {19}  = 0.6 + 0.019  ( \dfrac{1}{1-0.01})

0.6\overline {19}  =0.6 +  \dfrac{19}{1000}\times  \dfrac{100}{99}

0.6\overline {19}  = 0.6 +  \dfrac{19}{990}

0.6\overline {19}  = \dfrac{594+19}{990}

0.6\overline {19}  = \mathbf{\dfrac{613}{990}}  

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