1. Suppose that a byte contains the ASCII code of an uppercase letter. What hex number should be added to it to convert it to lower case. 2. For each of the following 16-bit signed numbers, tell whether it is positive or negative. 2.1. 78E3h 2.2. 9AC4h 3. Give the unsigned and signed decimal interpretations of each of the following 16-bit or 8-bit numbers. 3.1. ZFFEh 3.2. 7Fh