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20. (p. 101) Given that the ASCII code for the letter a is 97, which of the following hexadecimal strings represents the string "quiz"? a. 71746879 b. 71766A7B c. 7175697A d. 71756A7A 21. (p. 110) How many parity bits are required to correct single-bit errors for messages having a length 32 bits? a. 5 b. 6 C. 4 d. 7 22. (p. 58) Convert 3602, to base 10. a. 1325 b. 1247 C. 1415 d. 9275 23. (p. 110) Assuming we are using the Hamming algorithm presented in our text to design an error-correcting code, find the code word to represent the 10-bit information word 10 0001 1010 a. 10 0001 0101 1001 b. 10 0001 0101 1011 C. 10 0001 0100 1001 d. 10 0001 1101 1001 24. (p. 20) Which of the following was the mechanical computer that included mechanisms that provided memory and an arithmetic processing unit? a. Pascaline b. Atanasoff-Berry Computer C. Analytical Engine d. von Neumann calculator 25. (p. 71) Find the 16-bit two's complement representation of 101110 a. 1111 1100 0000 1101 b. 1111 1100 0000 1100 C. 1000 0011 1111 0011 d. 0111 1100 0000 1100