What is a rule for the sequence below?

1.8, 2.85, 3.90, 4.95, 6

So, when your answering these, take away the decimals (.). Whichever of the numbers that are in front of the.'s are larger than the other than their larger. I'm not saying your looking for the larger ones but if basically just mental math with dots. What exactly are you looking for?

The rule is add 1.05 because its 1.8 then its 2.85 so you add 1.05 to 1.8 and you will get 2.85 that is your answer.