Chapter 4.4, Problem 2P

a. There are 6 cars traveling together. Each car has 2 people in front and 3 in the back. Write an expression using the numbers 6, 2. and 3; the symbols ${}^{\text{x}}or.and+;$ and parentheses, if needed, for the total number of people riding in the 6 cars. If you use parentheses, explain why you need them; if you do not use parentheses, explain why you do not need them.

b. Describe a collection of things whose total number is given by the expression

   $6.2+3$