Answer: options C and D
Step-by-step explanation:
An Irrational Number is a real number that cannot be written as a simple fraction.
A . 2/3 is a rational number because it is a fraction
B . -[tex]\sqrt{81}[/tex] = -9 which could be written as -9/1 , so it is a rational number
C. 5.76262... is irrational because the decimal has no end point
D. [tex]\sqrt{2}[/tex] is a common example of irrational number , because finding the square root of 2 is also continuous .
Therefore , options C and D are irrational
