Answer:
10.
Step-by-step explanation:
Decimal numbering system is a number system which has ten digits. These ten digits are 0,1,2,3,4,5,6,7,8 and 9. It has signed and unsigned digits. The signed digits represents negative values of digit with the minus "-" sign written before the digit. The unsigned digits have no sign before them.
Binary numbering system has only 1 and 0 digits, while the hexadecimal number system has 16 digits.