2 years ago

20x + 5 24.x-1 what’s x?

Mathematics

1 answer:

iogann1982 [59]2 years ago

7 0

Step-by-step explanation:

20x+5=24x-1

4x=6

x=3/2

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ANSWER

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The sum of the first $n$ terms of a geometric sequence is given by;

$S_n=\frac{a_1(1-r^n)}{1-r} ,-1$

Where $n$ , is the number of terms and $a_1$ is the first term.

When $n=5$ , we have $a_1=81$ , we get;

$S_5=\frac{81(1-(\frac{1}{9})^5)}{1-\frac{1}{9}}$

$S_5=\frac{81(1-\frac{1}{59049})}{1-\frac{1}{9}}$

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