Which explicit function defines this geometric sequence? 3, 1, 1/3, 1/9, ...

A. f(n) = 1/3 x 2^(n-1)
B. f(n) = 3 x (1/3)^(n-1)
C. f(n) = 1/3 x 3^(n-1)
D. f(n) = 2 x (1/3)^(n-1)

6/20

step-by-step explanation:

my guess would be b and d, but i didn’t actually get out the pen and paper. lol

answer: it is 8

step-by-step explanation:

you know why its 8

"standard form:

3x2 + 14x − 10 = 0

solutions based on quadratic formula:

x1   = −14 − √ 142 − 4×3×(−10) /   2×3   = −14 − 2 × √ 79 /   6   ≈ −5.296

x2   = −14 + √ 142 − 4×3×(−10) /   2×3   = −14 + 2 × √ 79 /   6   ≈ 0.629