Ascending order means from lowest to highest, so to write these in ascending order.....
4.8 would be the lowest. Then, √26. This equals about 5.1.
Next would be 5.5. And finally, 2 + √22. √22 = about 4.6. 2 + 4.6 = 6.6
4.8 √26 5.5 2 + √22
There is your answer!