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3 years ago

Someone plz help me .

Mathematics

2 answers:

victus00 [196]3 years ago

8 0

Answer:

3 , 4 = 2×2×3 = 12
2 , 4 = 2×2 = 4
8. 3 = 2×2×2×3 = 24
15 , 6 = 2×3×5 = 30
14 , 7 = 2×7 = 14

Alex787 [66]3 years ago

5 0

Answer:

12, 4, 24, 30, and 14 are the answers

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Answer:

The sum of the first nine terms of the sequence is 74.44.

Step-by-step explanation:

Geometric sequence concepts:

The nth term of a geometric sequence is given by the following equation.

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In which r is the common ratio.

This can be expanded for the nth term in the following way:

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$a_{3}r^{5} = a_{8}$

$3.645r^{5} = 15$

$r^{5} = \frac{15}{3.645}$

$r = \sqrt[5]{\frac{15}{3.645}}$

$r = 1.327$

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$a_{1} = \frac{a_{3}}{r^{2}}$

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$a_{1} = 2.07$

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$S_{9} = \frac{2.07*(1 - (1.327)^{9})}{1 - 1.327} = 74.44$

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