Based on the date the students observed the last quarter of the moon, they will likely be able to observe a new moon on May 18.
The new moon is visible two weeks after the full moon and a week after the last quarter of the moon.
The students observed the last quarter of the moon on May 11 which means that the new moon will most likely come a week later on May 18.
Find out more on the new moon at https://brainly.com/question/13538936.