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anonymous
 one year ago
Write the explicit formula for the geometric sequence
a1 = 5 a2 = 20 a3 = 80
I already picked "A" so i'm not including it
I think the right answer is D but i am not certain.
B. an = 5(4)n1
C. an = 4(5)n1
D. an = 5 • (4)n
anonymous
 one year ago
Write the explicit formula for the geometric sequence a1 = 5 a2 = 20 a3 = 80 I already picked "A" so i'm not including it I think the right answer is D but i am not certain. B. an = 5(4)n1 C. an = 4(5)n1 D. an = 5 • (4)n

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welshfella
 one year ago
Best ResponseYou've already chosen the best response.1the formula for the nth term an = a1r^(n1) where a1 = first term and r = common ratio common ratio ra = second term / first term = 20/5 = ? D is not correct

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1common ratio r = 20/5 = 4 ( + /  = )
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