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m_a_m_a [10]
3 years ago
11

20 POINTS FOR EVER SOLVES THIS

Mathematics
2 answers:
Bas_tet [7]3 years ago
5 0

Answer:

1 or a or the first one

Katyanochek1 [597]3 years ago
4 0

Answer:

I think the first one is correct

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The sum of the first 6 terms of a geometric series is 15,624 and the common ratio is 5. What is the first term of series?
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Answer:

<h2>4</h2>

Step-by-step explanation:

Suppose

  • S = sum of the six terms
  • a1 = the first term

\left. { S = a _ { 1 } \frac { 1 - 5 ^ { 6 } } { 1 - 5 } } \\\\ { \Leftrightarrow S = \frac { a _ { 1 } } { 4 } ( 5 ^ { 6 } - 1 ) } \\\\ { \Leftrightarrow a _ { 1 } = \frac { 4 S } { 5 ^ { 6 } - 1 } } \right.

then a1 = (4×15 624)÷(5^(6)-1)

            = 4

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tatuchka [14]

Answer:

Step-by-step explanation:

(4x+3)²÷(x-10)

=(16x²+24x+9)÷(x-10)

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       16x²-160x

       -      +

   ------------------

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               184x-1840

              -      +

             ----------------

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Change 28% to a decimal by moving the decimal point 2 places to the left:

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Write the question as an equation to get:

56 = 0.28x


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x = 56 / 0.28

x = 200

The unknown number is 200.

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