At first I thought this was an arithmetic sequence. Adding 10 to 85 produces 95. Adding 10 to 95 produces 105. But I don't see where that 100 came from. Double check, please, to ensure that you have copied down the entire original problem and done it correctly.
Note that 85 plus 5 is 90; 90 plus 5 is 95; 95 plus 5 is 100; 100 plus 5 is 105. This is just an example to show you one possibility.
This is an arith. sequence ONLY IF you add the SAME number each time to find the next term of the sequence.
