How many square feet of carpeting are needed to carpet a 12-foot x 12-foot room?

Revelation most nearly means:

If a house key, a wooden spoon, a plastic hanger, and a wool jacket are all the same temperature, which one feels the coldest?

Light waves travel at a rate of about:

A three-digit code must be used to access a computer file. The first digit must be an A or a B. The second digit must be a number between 0 and 9. The final digit is a single letter from the alphabet from A to Z.
How many possible access codes can there be?