i have only 3 quesntions and ve 9 mins please help me

answers can me more than one

Question 1 Logic gates: compute the result only for such expressions which are always true regardless of variable values occur in the processor are, on their own, universal computing machines Question 2 An arbitrary positive integer: has a uniquely defined representation in the octal system has the same representation in the sign-magnitude convention and in the two's complement convention (assuming that it fits into a processor register) has the same number of digits in its base 5 representation as in its base 7 representation Question 8 A number with 6 digits (in its decimal notation) will: have between 15 and 21 digits in its binary notation always occupy less than 21 bits in its notation in the 2's complement encoding always occupy less than 21 bits in its notation in the sign-magnitude encoding