using the "groups of 4" method in reverse. ch of the following hexadecimal numbers to its equivalent binary representation a) D b) 1A c) 16 d) 321 e) BEAD 4. [15] Convert each of the following binary numbers to its equivalent octal and hexadecimal representations. a) 10000001 b) 101010100 c) 10001000.111 d) 1100001.1 e) 110111.01 5. [5] Convert the following hexadecimal number to its decimal equivalent using the polynomial function method. a) B216 6. [5] Convert the decimal number 0.625 to its binary, octal, and hexadecimal equivalents. Show your work