Answer
3.
0123456789ABCDEF000000010010001101000101011001111000100110101011110011011110111191F100100011111
( 91F )16 = ( 100100011111)2
===================================
4.
Continually divide decimal number by 16 to give a result and aremainder. Write down the remainder (in hexadecimal).
DivisionResultremainder (in dec)remainder (in hex)915 / 16573357 / 163993 / 16033
Read the remainders from bottom to top.
( 915 )10 = ( 393 )16