If 400 bricks measuring 81" by 31" are required to build a wall 42 ft. high, how long is the wall? feet.

Fred has a total of 62 dvd and cd. if the number of cd is three more than two times the number of dvd, how many cd does he have?

What is the area of triangle abc if a = 8, b = 11, and c = 15?

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?