A. convert 21.0 cm to inches. show your dimensional analysis setup. b. convert 29.7 cm to inches. show your dimensional analysis setup. c. state the dimensions, in inches, of the international standard for a letter-sized piece of paper. d. which piece of paper is longer: a u. s. letter-sized piece of paper, or an international letter-sized piece of paper? e. suppose the united states adopted the international standard for letter-sized paper. explain at least two things that might result from this change