Respuesta :

DeanR

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.