Help! I been on this forever!!

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

1c) the number 131 is a term in the sequence defined by the explicit rule f(n)=5n-4. which term in the sequence is 131? 2a) write the first four terms of the function f(n)=n^2-1 2b) what is the 10th term of the sequence defined by the explicit rule f(n)=n^2-1 2c) the number 224 is a term in the sequence defined by the explicit rule f(n)=n^2-1. which term in the sequence is 224?

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex