Which strategy would you use to find 2+8 explain

You would simply use addition. If you would like me to get more in-depth with this, please let me know and I will further assist you!

Count out Eight fingers and then add Two more fingers and then count them all together (Ten).

40 because it’s just a little longer than 32 feet

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.