Give the first four terms of a geometric sequence having a1=18 and r = 2.

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01-06-2016
Mathematics

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Give the first four terms of a geometric sequence having a1=18 and r = 2.

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Write a function number_of_pennies() that returns the total number of pennies given a number of dollars and (optionally) a number of pennies. ex: 5 dollars and

caylus caylus · Answer 1 · 2016-06-01T08:36:59-04:00

caylus caylus

01-06-2016

Hello,

[tex] a_{1}=9*2=18 [/tex]
[tex] a_{2}=9*2^{2}=36 [/tex]
[tex] a_{3}=9*2^{3}=72 [/tex]
[tex] a_{4}=9*2^{4}=144 [/tex]

[tex] a_{n}=9*2^{n} [/tex]

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