-15 is 11111111
and 2s com is 1111 0001
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111111 in binary is 255 in decimal which is FF in hexadecimal (i.e. 15 units and 15 16s)
9: 1001 10: 1010 11: 1011 12: 1100 13: 1101 14: 1110 15: 1111 16: 10000
15 = 1111
1111
It is: 75 degrees