Help me with this :)))

Problem fathi wants to print out a pdf document that is 48 pages long. to save paper, he decides to print on both sides of each sheet and to print two pages on each side of the sheet. how many sheets of paper will he need?

Need on this one asap im almost done with this subject

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons