Assignment Three 1. Convert this 8-bit number written in 2 's complementary binary form (10110110)2 to the decimal number ( )10 Note: Because the leftmost bit (the sign bit) is 1 , the number is negative! The leftmost bit 1 is worth 127. It contributes to the sign and the magnitude of the number. Assignment Four Assume that some computers used a 21-bit word to store numbers. What is the decimal range for this word size for: (a) unsigned numbers: (b) signed numbers: What is the number of unique patterns 21 bits can store