You swim 121 out of 1,000 meters. how can you write this as a decimal

The answer to this is: 121 / 1000 = 0.121 

 The way to write this as a decimal would be 0.121.

Letter c i’d say

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.