Mohamed decided to track the number of leaves on the tree in his backyard each year. The first year, there were $500$ leaves. Each year thereafter, the number of leaves was $40\%$ more than the year before. Let $f(n)$ be the number of leaves on the tree in Mohamed's back yard in the $n^\text{th}$ year since he started tracking it. **$f$ is a sequence. What kind of sequence is it?** [[☃ radio 1]] **Complete the recursive formula for $f(n)$.** $f(1)=$ [[☃ input-number 3]] $f(n)=f(n-1)$[[☃ dropdown 1]][[☃ input-number 4]]