Z=72, i was working on it and that’s what i got
Answer:
f(n)= 5 · 4

Step-by-step explanation:
You use the explicit formula for geometric sequence. The five is the firat term and is placed correctly. The 4 is the rate of change, because if you multiply 5 by 4 you get 20 and so on.
No nodcause it has to me in y=mx+b form. so just sub. 1 from each side