Answer:
Option A for first question.
Options C and D for second question.
Explanation:
Which set of numbers does 13−−√ belong?
The answer is option A: irrational numbers
This is because the square root of 13 is a decimal number that does not end. Irrational numbers are those which cannot be expressed in a ratio form and also cannot be written as a simple fraction.
To which sets of numbers does −1/4 belong?
The answer is option C and D: rational numbers and real numbers
This is because real numbers are made up of rational and irrational numbers. We also know that every real number is either a rational number or irrational number.