tell whether each sequence is arithmetic to justify your answer. if the sequence is arithmetic write a function rule to represent it:
A) 5,10,15,20,...
B) 200,100,50,25,12.5,...
C)-8.1,-5.8,-3.5,-1.2,...
A) common difference is 5
B) geometric ... common ratio is 1/2
C) common difference is 2.3