Answer:
See step by step.
Step-by-step explanation:
20 * 4 = 80
80 / 2 = 40
40 * 4 = 160
160 / 2 = 80
80 * 4 =320
if x is Nth number in the sequence:
if N is odd:
[tex]x = 20 * 4^{(N-1)/2} / 2^{(N-1)/2}[/tex]
if N is even:
[tex]x = 20 * 4^{(N)/2} / 2^{(N)/2-1}[/tex]
