Answer: 1.) always
2. never
3. Square root of 65 is irrational. 3.5 and 19/20 are both rational. -6 is an integer.
4. -10 and -11
5. 19
Step-by-step explanation:
1. If a number can be expressed as a ratio of integers or as a fraction with an integer in the numerator and and a non-0 integer in the denominator, it is a rational number.
2. Natural numbers are the counting numbers, the whole numbers above 0
4. -√105 ≈ -10.24695077
5. Thank goodness for calculators!