Practice exercise for Module 1 la. Convert 18 decimal to a binary word and to a hexadecimal word. Clearly show your work. 1b. Check your work by converting your answers in la back to decimal. 2. Find the binary absolute value of the negative value 1010 1010 3a. Convert -18 decimal to a binary word and to a hexadecimal word. Clearly show your work. 3b. Check your work by converting your answers in 3a back to decimal. 4. Add the binary value: 0110 0001 + 1010 1111 5. Subtract the binary value: 0110 0001 - 1010 1111