please help meeee!!!!

Question

What is the explicit formula for the sequence below?

160, 40, 10, 2.5, …

Answer 1

160, 40, 10, 2.5, ...

This is geometric sequence with first term a₁ = 160 and common ratio r = 40/160 = 0.25;

So general term a_n = a₁r^n-1; a_{n = 160(0.25)}^n-1.