Amountain climber climbed down a cliff 50 feet at a time. he did this 5 times in one day. what was the overall change in his elevation?

Well if he claimed down 50 feet at a time and did it 5 times in a day you just take 50 times 5 and you will get your total elevation change.

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.