Pls me with 4, 5, and 6! (show work! ) + lots of

Asequence is defined recursively by the formula  f(n  +  1)  =  f(n)  +  3 . the first term of the sequence is  –4. what is the next term in the sequence? –7–117

The estimated number of people to attend the last bengals game of the season was 2000. the actual number of fans attending was 1200. by what percent did the estimate differ from the actual?

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30