QUES: The fastest and easiest way to open your HBX file is to doubleclick it

correct the punctuation.

CORRECTED: The fastest and easiest way to open your HBX file is to double-click it.

QUES: Finally we quote again from the writings of Archytas about his theory of how to learn

correct the punctuation.

CORRECTED: Finally we quote again from the writings of Archytas about his theory of how to learn.

QUES: In his work in optics is described as follows

correct the punctuation.

CORRECTED:
In his work in optics is described as follows: