Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.4 - Integers: Multiplication and Division - Problem Set 1.4 - Page 26: 50

3

Recall, when we are simplifying a fraction, we do addition and subtraction in the numerator and denominator before we divide. Thus, we obtain: $ -21 \div -7$ In this problem, we are dividing two negative numbers. Remember, when we divide two negative numbers, the negatives cancel out, meaning that our answer will be positive. Thus, we find: $-21 \div -7=3$