Answer: 
Step-by-step explanation:
The nth term for a geometric sequence is given by :-
(1)
We are given that The first term in a geometric sequence is 54. i.e. a=54
5th term=
(2)
Put n=5 and a= 54 in (1), we get
(3)
From (2) and (3), we have

Explicit form for the geometric sequence: 
No info was given, plz post a pic of the equation
Answer:
Step-by-step explanation: for 8 thirds use the long lines to count back from 5 to 0 then once u get 0 use the little lines to get to 8 thirds towards 5 and do the same for -11 thirds but towrds -5
1/2 - 5/12= 6/12 - 5/12 = 1/12