Final answer:
The measure of DN is found by adding the lengths of DE and EN, which results in DN being 24.75 units in length.
Step-by-step explanation:
The student asked what the measure of DN is, given that E is between D and N, DE is 11.5 units, and EN is 13.25 units. To find the length of DN, you simply add the lengths of DE and EN together.
DN = DE + EN
DN = 11.5 + 13.25
DN = 24.75 units
Therefore, the measure of DN is 24.75 units.