How is the number 56 (8) represented in binary notation?

1) How is the number 56 (8) represented in binary notation? 2) which of the numbers follows the number A1 (16) in the hexadecimal system 3) how many significant zeros are in the binary notation of the number 254 (10)? 4) What is the sum of the numbers x and y at x = 1011 (2), y = 41 (8)? 5) what is the sum of the numbers x and y at x = 10011 (2) y = 23 (16) written in the binary number system?

1) 56 (8) = 101110 (2)
2) A2 (16)
3) 254 (10) = 11111100 (2), so 2 significant zeros
4) 1011 (2) + 41 (8) = 11 (10) + 33 (10) = 44 (10)
5) 10011 (2) + 23 (16) = 19 (10) + 35 (10) = 54 (10) = 110110 (2)