Need help on 5 and 6 finding the unit rate PLEASE HELP!!

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?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers