Which of these numbers is irrational? select all that apply
A. V72
B. 1.2785918431...
C. 7/9
D. V36
The irrational numbers are numbers that cannot be written as fractions and have non-repeating decimal representations.
A. √72 can be simplified as √36 * √2 = 6√2. Since 6 and √2 are both rational numbers, √72 is a rational number.
B. 1.2785918431... represents a non-repeating decimal, but without further information, we cannot determine if it is rational or irrational.
C. 7/9 is a fraction and can be written as a ratio of two integers, so it is a rational number.
D. √36 = 6, which is a rational number.
Therefore, none of the given numbers are irrational.