18. (20 Points) Write the resulting logic function in terms of A and B. Then use Demorgan's law to simplify. All gates used are 2 input NAND gates. Show all work, otherwise no full credit. A D 19. (20 Points) Subtract 11 from 6 (6-11) using 8 bit 2's complement math. Show all work or else you get no credit. 20. (20 Points) What are important design characteristics for today's computers and why? Circuits - Single Processor or Multiprocessor Why? Power - More Transistors or Less Transistors Why? Voltage - 3.3v or 1.2V Why? 3rd Party - Many Makers or Monopoly Why