Can you help me with these problems ? Please show your work. Thank you

Find the value of these unsigned numbers, and convert them to binary representation a. (12EFB35C)_16 = (?)_2 Use unsigned binary to decimal conversion for following binary numbers a. (00011111)_2 = (?)_10 b. (0000 0000 0000 0000 0000 0000 0001 1111)_2 = (?)_10 Do the following decimal to binary conversion for unsigned numbers. a. Convert (104)_10 to 8 bit binary representation b. Convert (140)_10 to 32 bit binary representation Do the following conversion a.(10111111011011000101010100)_2 = (?)_16 Perform the arithmetic operation value of "-15 - 35" in 8-bit signed binary system