True or False
1. The ratio of two real numbers is never zero.
2. The difference of two real numbers is always a real number.
3. The sum of two real numbers is always a real number.
4. The quotient of two real numbers is always a real number (provided the denominator is non-zero).
5. The quotient of two real numbers is always a rational number (provided the denominator is non-zero).
6. The product of two real numbers is always a real number.
7. The difference of two real numbers is always an irrational number.