1. Convert the 8-binary binary expansion (1010 0110)2 to a decimal expansion.

2. Convert the following decimal expansion (124)10 to an 8-bit binary expansion.

3. Convert the following hexadecimal expansion (CA3)16 to an octal expansion.

4. Convert the following binary expansion (0101 1001 1010 0110)2 to a hexadecimal expansion.