Final answer:
The numbers 2/3, 15, and 0 are rational numbers, 7.4 is a rational number, and 3.1415926532, √1, and √3 are irrational numbers.
Step-by-step explanation:
The numbers 2/3 and 15 are rational numbers because they can be expressed as fractions. The number 0 is also rational because it can be written as 0/1. The number 7.4 is rational because it can be written as a fraction, 74/10. On the other hand, the numbers 3.1415926532, √1, and √3 are irrational numbers because they cannot be expressed as fractions and their decimal representations go on forever without repeating.