What does pdf stand for in computer terms?

What is the biggest difference between section breaks and regular page breaks

Lakendra finished working on her monthly report. in looking it over, she saw that it had large blocks of white space. what steps could lakendra take to reduce the amount of white space?

Aman travel 200m towards east< br /> from his house then takes left< br /> to turn and moves 200 m north< br /> find the displacement & distance.< br />