14 Which of the following is an irrational number? A sqrt (25) B 10.25 C (2)/(3) D sqrt (18)

The correct answer is D) .An irrational number is a number that cannot be expressed as a fraction of two integers. In other words, it cannot be written as a simple fraction.Let's analyze each option:A) : The square root of 25 is 5, which is a rational number because it can be expressed as the fraction .B) 10.25: This is a decimal number that can be expressed as the fraction , so it is a rational number.C) : This is already in the form of a fraction, so it is a rational number.D) : The square root of 18 cannot be simplified to a whole number or a simple fraction. It is an irrational number because it cannot be expressed as a fraction of two integers.Therefore, the correct answer is D) .