$1\mathrm{.}8$ While browsing at Billy Bob's computer store, you overhear a customer asking Billy Bob what is the fastest computer in the store that he can buy. Billy Bob replies, "You're looking at our Macintoshes. The fastest Mac we have runs at a clock speed of $1\mathrm{.}2GHz.$ If you really want the fastest machine, you should buy our $2\mathrm{.}4-$GHz Intel Pentium IV instead." Is Billy Bob correct? What would you say to help this customer?

$1\mathrm{.}9$ The ENIAC, a precursor to the ISA machine, was a decimal machine, in which each