I NEED ANSWERS QUICKLY PLEASE HELP!!! (I WILL GIVE BRAINLIEST TO WHOEVER ANSWERS FIRST WITH THE CORRECT ANSWER!!!)

f(n)=-3n-1
Given this explicit equation, what is the common difference?

Answer :

1004959

Answer:

the answer is f = 3 + -1n-1

Step-by-step explanation:

i dont know if correct tryed my best

The answer is +=3+_ on-1