Which of these sequences are geometric sequences? Select all that apply.

А: 2, 4, 8, 16, 32, 64, 128...
B: 100,-50, 25, -12.5, 6.25,-3.125, 1.5625, -0.78125...
C: 3, 6, 9, 12, 15, 18, 21...
D: 1, 1, 2, 3, 5, 8, 11...

d? maybe

step-by-step explanation:

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

answer: 5

step-by-step explanation: