Asked by Gloria

Hi! I need help with this question. Thank you!

Directions: Write the expression for the nth term of the following geometric sequence.

5, 10, 20, 40, ...

Answers

Answered by Bosnian
10 = 2 * 5

20 = 2 * 10

40 = 2 * 20

I geometric sequence :

an = a1 * r ^ ( n - 1 )

where a1 is the first term of the sequence.

r is the common ratio.

n is the number of the term to find

In this case :

a1 = 5

r = 2


an = a1 * r ^ ( n - 1 )

an = 5 * 2 ^ ( n - 1 )
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