1. How can you show that a number is a rational
number?

The product of any two rational numbers is therefore a rational number, because it too may be expressed as a fraction. For example, 5/7 and 13/120 are both rational numbers, and their product, 65/840, is also a rational number.

Step-by-step explanation:

To decide if an integer is a rational number, we try to write it as a ratio of two integers. An easy way to do this is to write it as a fraction with denominator one. Since any integer can be written as the ratio of two integers, all integers are rational numbers

step-by-step explanation:

20% of 120 is 24. if you subtract 24 from 120 you get 96