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Mekhanik [1.2K]
3 years ago
5

12x-9=10x-15 Help me answer this please

Mathematics
1 answer:
zvonat [6]3 years ago
3 0

Answer:

x = -3

Step-by-step explanation:

Given:

12x - 9 = 10x - 15

Now, let's add 15 to both sides of the equation.

12x + 6 = 10x

Now, let's subtract 12x from both sides of the equation.

6 = -2x

Now, let's divide both sides by -2.

-3 = x

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jek_recluse [69]

Answer:

S_{31}=71.3


Step-by-step explanation:

The nth term of an arithmetic sequence is given by the formula,

U_n=a_1+(n-1)d


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\Rightarrow 17=a_1+(9-1)(-2.1)


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The sum of the first n-terms is given by the formula,


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To find S_{31}, we substitute n=31, a_1=\frac{169}{5} and d=-2.1.


\Rightarrow S_{31}=\frac{31}{2}(2(\frac{169}{5}+(31-1)(-2.1))


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\Rightarrow S_{31}=\frac{713}{10}


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The correct answer is D















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Step-by-step explanation:

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