please help

Which sequence could be partially defined by the recursive formula f (n + 1) = f(n) + 2.5 for n ≥ 1?

2.5, 6.25, 15.625, 39.0625, …

2.5, 5, 10, 20

–10, –7.5, –5, –2.5, …

–10, –25, 62.5, 156.25

Question

please help 

Which sequence could be partially defined by the recursive formula f (n + 1) = f(n) + 2.5 for n ≥ 1?


2.5, 6.25, 15.625, 39.0625, …

2.5, 5, 10, 20

–10, –7.5, –5, –2.5, …

–10, –25, 62.5, 156.25

danjs · Answer

each next term is 2.5 more than the last term

anonymous · Answer

So would the answer be the last one? @DanJS

danjs · Answer

sorry i had to run for a few min

danjs · Answer

the next term is the term before +2.5

-10 + 2.5 = -7.5
-7.5 + 2.5 = -5
-5 + 2.5 = -2.5