I need help please with these questions I don't understand

Question

For the three-part question that follows, provide your answer to each question in the given workspace. Identify each part with a coordinating response. Be sure to clearly label each part of your response as Part A, Part B, and Part C.

Use the sequence a_(n )= 7n-5 for Part A, Part B, and Part C. 

Part A: If the range value is 16, what is the domain value? Show your work. 

Part B: If the range value is 58, what is the domain value? Show your work. 

Part C: Hunter says that the domain value is  when the range value is  . Is Hunter correct? Explain why or why not, and show your work to support your answer. 

Answer 1

an=7n-5, it's an arithmetic sequence with a common difference=7

16=7n-5

7n=21

n=3 means the 3rd term in the sequence

a1 =2

a2=9

a3 =16

a4 =23

a5=30

a6=37

a7=44

a8=51

a9=58

n=9, the 9th term in the sequence for part B)