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22-08-2018
Mathematics

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5, 10, 20, 40, ...
What is the common ratio, recursive formula, and explicit formula.
Is it geometric?

5 10 20 40 What is the common ratio recursive formula and explicit formula Is it geometric class=

Respuesta :

22-08-2018

5 10 20 40

10/5 = 2

20/10 = 2

40/20 = 2

Common ratio: [tex]r=2[/tex]

Explicit formula: [tex]a_n = 5 (2^{n-1})[/tex]

Recursive:

[tex]a_{n+1} = 2 a_n[/tex]

[tex]a_1 = 5[/tex]

This is a geometric sequence.

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