Which of the following is NOT a real number?

Yes.

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Sorry, completely misread the order of the letters. No, b is correct. Because 13/0 is undefined.

ohhhhh

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The square root of 1/16 is 0.25 which is a real number. When the number under the square root is negative , that's when you have a number that is not real.

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Yes, you are correct. The square root of 1/16 is not a real number.

To determine whether each option is a real number or not, let's go through them step by step.

a) 0.0005: This is a real number because it is a decimal representation of a finite value.

b) 13/0: This is not a real number. Division by zero is undefined in mathematics, so this fraction does not represent a real number.

c) Square root of 1/16: This is not a real number. The square root of any positive number is a real number. However, the square root of a negative number is not a real number. In this case, the square root of 1/16 is equal to 1/4, which is a positive number. So, this option is incorrect.

Therefore, the correct answer is c) square root of 1/16.