Terms and common ratios, HELP!?

1 ⤊

In a geometric sequence, the first term is 5 and the common ratio is 3. What is the sixth term?

a) 1215
b) 3645
c) 90
d) 25

2007-03-05 02:22:22 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

t[n] = ar^(n - 1), so if we want the 6th term, then

t[6] = 5(3)^(6 - 1) = 5(3^5) = 3645

2007-03-05 02:28:12 · answer #1 · answered by Puggy 7 · 1⤊ 0⤋

the nth term is t(n) = ar^n and therefore the 6th term is that for n = 6 or t(6) = 5x 3^6 = 3645

2007-03-05 10:29:01 · answer #2 · answered by physicist 4 · 0⤊ 0⤋