Question

The sequence is 60,30,15,15/12 btw if you can’t see it clear in the image.

Answer 1

The sequence is arithmetic, so

Explicit formula is:

for a1 = 60 and d = -30

$\begin{gathered} a(n)=60-30(n-1) \\ a(n)=60-30n+30 \\ a(n)=90-30n \end{gathered}$

Recursive formula is:

$\begin{gathered} a(n)=a_{n-1}-30,\text{ for n>1} \\ a(1)=60 \end{gathered}$