Chapter 4.4, Problem 3P

The students in Mrs. Black’s class are arranged as follows: 7 tables have 4 students sitting at each of them; 2 tables have 3 students sitting at each of them. Write an expression using the numbers 7, 4, 2, and 3; the symbols ${}^{\text{x}}or.and+;$ and parentheses, if needed, for the total number of students in Mrs. Black’s class. If you use parentheses, explain why you need them; if you do not use parentheses, explain why you do not need them.